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This Church is our heavenly Father's house, a place of solace and grace, so feel at home. Enter reverently, pray quietly, sing joyfully, listen attentively, give cheerfully, and come back gladly. We are a welcoming Catholic Community called by God to live out the message of Christ in love and service to all people. If you are new to our Community, WELCOME!

St. Denis Catholic Community
2151 S. Diamond Bar Blvd.,
Diamond Bar, CA 91765

For our schedule for Masses, Confessions, Eucharistic Adoration, Holy Hours, and hours for the church and the chapel, please click here.

For current and past worship aids, please click here.

Pastoral Office is open
    9:00 a.m. to 5:00 p.m.
    every day, except Tuesdays and holidays.

Phone:  (909) 861-7106
Fax:  (909) 861-2697





A New Approach to Faith Formation at St. Denis

Teaching children, teens, and adults how to have
a close, personal relationship with Jesus

(Please click here for Fr. John's open letter to the parish.)  




Religious Education
(children in preschool through grade 8)
Information and Registration


Teen Confirmation
Information and Registration



Adult Confirmation
Information and Registration



Zooming at St. Denis

Faith Formation, Prayer, and Fellowship
Weeknights via Zoom

Mondays at 7:30 p.m.

Every Monday at 7:30 p.m. via Zoom, one of our deacons or priests leads parishioners to reflect on and pray with the Gospel for the upcoming Sunday. 

The next meeting will be on Monday, October 25, when Deacon Al will lead parishioners to reflect on and pray with the Gospel for Sunday, October 31.  To join this meeting, please click on the following Zoom link shortly before 7:30 p.m. on Monday:
(The same link is used for every Monday night Zoom meeting.)

In addition, please print out (or open in a separate tab in your web browser or on a separate screen) this handout, which you will need for this prayer meeting.


Tuesdays at 7:30 p.m.

Every Tuesday at 7:30 p.m. via Zoom, Fr. John leads our Scripture Reading and Sharing Group, which is reading through the Book of Psalms in sequence through Psalm 150.  At each meeting, the participants take turns reading one or two Psalms; they discuss the Psalms and how the Psalms speak to us in the 21st century; and they pray with the Psalms. 

The next meeting will be on Tuesday, October 26 at 7:30 p.m.  To join them, please click on the following Zoom link shortly before 7:30 p.m. on Tuesday:
(The same link is used for every Tuesday night Zoom meeting.)


Second Wednesday of the month at 7:30 p.m.

To help parents raise their children in this challenging, secularized world, St. Denis has monthly Zoom meetings for parents.  These Zoom meetings are led by Deacon Dennis and Christina Shin and our parenting ministry team.  The meetings are held on the second Wednesday of each month at 7:30 p.m.  Each meeting includes prayer, a talk and video on a relevant parenting topic, and small-group discussions.

The next meeting will be on Wednesday, November 10 at 7:30 p.m.; and the topic will be announced soon and will be posted here.  All parents are welcome, even those who missed previous meetings.

To attend the meeting on the Wednesday, November 10, please click on the following Zoom link shortly before 7:30 p.m.:  (The same link will be used for every Wednesday night Zoom meeting.)

For more information about the Wednesday night meetings or about the next round of our Christian Parenting Course, please send an E-mail with your mobile phone number and E-mail address to Deacon Dennis at this address:  You also can call the Pastoral Office at (909) 861-7106 for more information. 



Consecration to St. Joseph

September 30 – November 6

In a recent Apostolic Letter, Pope Francis proclaimed this year as the Year of St. Joseph to mark the 150th anniversary of the proclamation of St Joseph as Patron of the Universal Church.  In the Letter, Pope Francis described St. Joseph as a beloved father; a tender and loving father; an obedient father; an accepting father; a father who is creatively courageous; a working father; a father in the shadows; a father to Jesus; and a father for us.

To mark this Year of St. Joseph, Deacon Al will lead parishioners in 33 days of prayer and preparation, leading to their consecration to St. Joseph on Saturday, November 6 at 8:30 a.m.  During the 33 days of preparation, Deacon Al and parishioners will meet every Thursday from 7:30-8:30 p.m. from September 30th through November 4th.  Participants can attend the meetings either in person (in the church) or via Zoom.  The Zoom link for all of the meetings will be:  All are welcome, even if you missed previous meetings.

To prepare parishioners for their consecration, Deacon Al will use the following book:  Consecration to St. Joseph:  The Wonders of Our Spiritual Father by Fr. Donald H. Calloway.  You will need this book to participate fully in the 33 days of preparation.  The book is widely available—e.g., on (for $13.39), on Kindle (for $9.95), on Audiobook (for free with an Audible trial), and elsewhere.  The Pastoral Office has about 10 copies of the book; and they are available for $14.00.  For more information, please contact the Pastoral Office at (909) 861-7106.   

For an overview of the book by the author, please watch this video:



Halloween/All Saints’ Day
“Trunk or Treat”

Saturday, October 30 from 10:00 a.m. – 12:00 noon
in St. Denis’s lower parking lot



Parents, bring your children (recommended ages 12 and under) dressed in costumes to St. Denis for “Trunk or Treat.”  You can park in an upper parking lot, bring the children to the lower parking lot, and accompany them as they trick or treat.  In the lower parking lot, about 20 parishioners with their vehicles will have their trunks open and decorated for Halloween; and they will distribute to the children wrapped candy and other treats in plastic bags.  Also, Halloween-themed music will be playing in the lower parking lot.

We recommend having the children dress as saints in anticipation of All Saints’ Day, which is Monday, November 1.  For ideas about how to dress your child as a saint, please see the above photo with children dressed as various saints, or search on Google for images of “Halloween saints costumes.”  This is a great way to teach your child about the saints in general and about a particular saint.  Your child also could dress in a standard Halloween costume—such as a ghost, a superhero, an alien, a witch, a monster, etc.    

For the “Trunk or Treat,” we encourage everyone to wear a face covering; and those who will distribute the treats will wear face coverings and disposable gloves.

Finally, parents please screen the candy and other treats before the children eat them (e.g., to ensure that the children are not allergic to the ingredients, such as peanuts or other nuts). 

Did you know that Halloween has Catholic origins?  Click here for more information.



Young Adult Ministry (YAM)

Upcoming Events


Every other Thursday
(next meeting on October 21)

YAM meets in person in the Hall at 7:30 p.m. every other Thursday for fellowship, prayer, and faith formation.  The next meeting will be on Thursday, October 21; and the topic will be:  “Faith as a young adult—how young adults can strengthen their faith and help other young adults strengthen their faith.”  Future meetings will be on the following Thursdays:  November 4, November 18, December 2, and December 16.

Last Saturday of the Month (October 30)

On the last Saturday of every month, YAM usually takes a field trip to hang out and have fun.  Past destinations have included the 626 Night Market at Santa Anita Park in Arcadia, the beach in Costa Mesa, the Irvine Spectrum Center, and the Santa Monica Pier.  Future destinations may include amusement parks, bowling, hiking, etc. 

On Saturday, October 30, YAM will participate in St. Denis’s Halloween/All Saints’ Day “Trunk or Treat” for children from 10:00 a.m. to 12:00 noon in the lower parking lot.  Parents will bring their children to the lower parking lot, and accompany them as they trick or treat.  In the lower parking lot, about 20 parishioners and ministries (including YAM) will park their vehicles, and will have their trunks open and decorated for Halloween; and they will distribute to the children wrapped candy and other treats.  Also, Halloween-themed music will be playing.

We encourage the adults and children to dress as saints in anticipation of All Saints’ Day, which is Monday, November 1.  For ideas about how to dress as a saint, please search on Google for images of “saints costumes adults.”  It's a good challenge to choose a saint and come up with a costume for him or her.  We recommend wearing a name tag to help others identify who you are; and then you can explain how the costume relates to the saint.  Of course, if you can’t come up with a costume for a saint, you don’t have to wear a costume; or you can wear a standard Halloween costume—such as a ghost, a superhero, an alien, a witch, a monster, a cartoon character, etc.    

Third Friday of the Month (November 19)

On the third Friday of every month, YAM meets in the church at 7:45 p.m. and participates in the Holy Hour, which usually is led by Deacon Dennis.  Afterward, YAM members hang out and often go out for food and refreshments.

For more information, follow YAM’s Instagram account; E-mail YAM at; or contact the Pastoral Office at (909) 861-7106.   



Golden Jubilee Year

Commemorating the 50th Anniversary of the
Founding of St. Denis Parish in Diamond Bar, California

Our Golden Jubilee Year will begin on Saturday, October 9, 2021 (the Feast of St. Denis) with a livestreamed Opening Mass (celebrated by Bishop David O’Connell) at 5:30 p.m.  Then, we will celebrate in our courtyard from 6:30-9:30 p.m. with food and drinks, music and entertainment, dancing, fellowship, a 50-50 drawing, and more.  The Jubilee Year will continue through Sunday, October 9, 2022, when we will celebrate a Closing Mass. 

The theme of the Jubilee Year is “Together with Christ,” because, as Jesus said in John 15:4-5, without him we can do nothing.

The Committee for our 50th Anniversary Jubilee Year is planning many different events and ways (both large and small) to celebrate this Jubilee Year.  Please go to our website ( and read the bulletin regularly for further details.  And if you have good ideas about how we can celebrate the Jubilee Year, please contact Committee Chair Tom Bertnsen at

Prayer for the Golden Jubilee Year

Heavenly Father, we thank You for the gift of St. Denis Parish—
for all of the priests, deacons, lay ministers, leaders, and staff who have served the parish,
and for the thousands of parishioners who have generously supported St. Denis
with their time, talent, and treasure over the past 50 years. 
Graciously bless them all. 

Help us to build on their legacy,
and to be good and faithful stewards of what You have entrusted to us.

Because we can do nothing without Your Son,
help us to know and love Him more each day,
and to be united with Him—and with each other—in all things,
so that:

            ●  Strengthened by Christ, we will persevere through the COVID-19 pandemic and every hardship.
            ●  Guided by Christ, we will proclaim the Gospel by our words and actions to every creature, including family, friends, and strangers.
            ●  Together with Christ, we will serve the poor and needy, and those on the margins of society.

Through the intercession of St. Denis, our patron saint,
and the Blessed Virgin Mary,
our mother and the mother of the Church,
please bless and renew us; and
bless and renew our beautiful parish.

We ask all of this through Jesus Christ, our Lord, in the unity of the Holy Spirit.



Jubilee Year for the 250th Anniversary
of the founding of Mission San Gabriel Arcángel


Mission San Gabriel Arcángel was founded in 1771 by the great Franciscan missionary Fr. Junípero Serra.  This mission is the first church in what is now the Archdiocese of Los Angeles.  And as Pope Francis has noted, St. Junípero Serra “was one of the founding fathers of the United States.”  Thus, this Jubilee Year recognizes not only the Church’s beginnings in Los Angeles, but also the Christian beginnings of America and the influence of Christian values in the formation of our national identity.

The Jubilee Year began on September 11, 2021 with an Opening Mass at the Cathedral of Our Lady of the Angels in downtown Los Angeles; and it will continue through September 10, 2022, when a Closing Mass will be celebrated at Mission San Gabriel Arcángel.

The theme of the Jubilee Year is “Forward in Mission.”  For more information about the Jubilee Year and upcoming events, please go to this website:



Together in Mission


This month, Archbishop José Gomez invites every Catholic to make a commitment to Together in Mission for 2021. 

Last year, Together in Mission raised $14 million, which was distributed to 67 poor parishes and 74 poor Catholic schools throughout the Los Angeles Archdiocese.  The poor parishes and schools used the money for educational programs, emergency projects, operational support, service to the poor, and outreach programs.

This year’s theme is “Forward with Faith.”  Our financially struggling parishes and schools were severely impacted by COVID-19.  As we emerge as one Catholic family from this pandemic, the call to help those in need is deeper and louder.

The archdiocese’s goal for Together in Mission this year is $15.35 million; and St. Denis has been asked to raise $114,875.  Last year, we exceeded our parish’s goal despite the pandemic; and we sincerely thank everyone who contributed last year and who will contribute this year to Together in Mission.

You do not have to donate any money now.  Instead, we are asking every household and family to make a new pledge this year to Together in Mission.  You can then take the rest of the year to fulfill your pledge. 

You may make a pledge in any of the following ways:
(1)  with the information that was mailed to your home;
(2)  with the pledge envelopes that are available in the pews and in the vestibule of the church;
(3)  visiting;
(4)  calling 213-637-7672 (Monday-Friday, 8 a.m. – 5 p.m.);
(5)  texting Forward21 to 213-397-0682.

However you make your pledge, please be sure to identify St. Denis Parish as your parish so that St. Denis will be credited with your pledge and donation.

Thank you for supporting Together in Mission.




Monday through Thursday:  8:00 a.m. (also livestreamed)
                                         6:30 p.m.

Friday:             8:00 a.m. (also livestreamed)
                       7:00 p.m. followed by a Holy Hour (also livestreamed)

Saturday:         8:00 a.m. (also livestreamed)
                       5:30 p.m. (Sunday vigil with cantor, organ/piano)

Sunday:           7:00 a.m. (no music)
                       9:00 a.m. (cantor, organ/piano)
                       11:00 a.m. (cantor, organ/piano; also livestreamed) 
                       1:00 p.m. (cantor, piano)
                       5:30 p.m. (contemporary music with cantors, piano; also livestreamed)

                       Sunday Mass Worship Aid with Readings (10/24/21)

Our livestreamed Masses and Holy Hours are livestreamed simultaneously to our YouTube channel and our Facebook page.  

"Permission to podcast/stream the music in these services is obtained from ONE LICENSE with license #A730717. All rights reserved.”

Obligation to attend Masses on Sundays and Holy Days of Obligation

With the reopening of California in the wake of the pandemic, Archbishop José Gomez has reinstituted the obligation for Catholics to attend Mass in person on Sundays and Holy Days of Obligation. 

However, those who have serious and legitimate reasons (e.g., illness; underlying health conditions that render them susceptible to illness; significant fears of becoming ill; etc.) are dispensed from this obligation (and, thus, are not obliged to attend Mass in person). 

Please note that watching a livestreamed Mass does not fulfill the obligation to attend Mass in person.  However, if you are unable to attend Mass in person, we encourage you to participate in our livestreamed Masses.  We livestream one or two Masses every day simultaneously to our YouTube channel and Facebook page

COVID-19 Reminders

Seating inside the church and in the courtyard

On June 15, 2021, we changed the seating inside the church so that more than half of the pews have normal seating, the way we used to prior to the pandemic.  However, we also have four pew sections on the sides reserved for socially distanced seating because we know that children under 12 are not vaccinated and that others are not fully vaccinated for various reasons.  In addition, we have socially distanced seating in our courtyard for those who prefer not to sit inside the church.

In accordance with the latest order by the L.A. County Department of Public Health, all people (age 2+) inside the church, the Pastoral Office, and the Hall need to wear a face covering.

For now, Holy Communion will be offered only in the form of bread.  To prevent the spread of germs, Communion on the hand is strongly encouraged.


Monday through Saturday:  After the 8:00 a.m. Mass in the courtyard
Friday:             5:00-6:00 p.m. in the church*
Saturday:         3:00-4:30 p.m. in the church* 
*Fr. Dennis will be in the back pew of the church; Fr. John will be in his confessional booth.

You also may schedule Confession with a priest at another time by calling the Pastoral Office (909-861-7106).

If you cannot go to a priest for Confession during this pandemic, Pope Francis encourages you to confess your sins directly to God and make an “Act of Perfect Contrition”:

“If you don’t find a priest to go to confession, speak to God.  He’s your Father.  Tell Him the truth. ‘Lord. I did this and this and this.  Pardon me.’  Ask His forgiveness with all your heart, with an act of contrition, and promise Him, ‘Afterward I will go to confession.’  You will return to God's grace immediately.”  (This quotation is by Pope Francis and is from this article.)

Here is another article with more information about how to make an “act of perfect contrition.”

Church and chapel hours
(except holidays)

Sunday: 6:30 a.m. – 7:30 p.m.
Monday through Friday: 7:30 a.m. – 9:00 p.m.
Saturday: 7:30 a.m. – 7:30 p.m.

Holy Hour and Eucharistic Exposition and Adoration in the church
(with seating inside the church and in the courtyard) 

Friday:             8:30-9:30 a.m.  Eucharistic Exposition and Adoration
                       7:45-8:45 p.m.  Holy Hour (Holy Hour Worship Aid (10/22/21))



Links for Livestreamed Liturgies

The livestreamed videos below are from our St. Denis YouTube Channel.  If you would like to watch more videos on our YouTube Channel, please click here.    

If you would like to watch our videos on Facebook, please click here


Upcoming Mass(es):

Mass, Tuesday at 8:00 AM (10/26/21)


Recent Daily Mass:

Mass, Monday at 8:00 AM (10/24/21)


Recent Sunday Masses:

Mass, Sunday at 11:00 AM (10/24/21)
Worship Aid


Mass, Sunday at 5:30 PM (10/24/21)
Worship Aid


Videos of all of our liturgies that were livestreamed or recorded are available on St. Denis’s YouTube channel.



Pope Francis:  COVID-19 vaccination is an "act of love"

This video by Pope Francis (and various cardinals and bishops) is in Spanish with English subtitles.



No Religious Exemption for the COVID-19 Vaccine

The Archdiocese of Los Angeles, in accordance with the Vatican and the U.S. Conference of Catholic Bishops (USCCB), recommends that all members of the Catholic community who can receive a COVID-19 vaccine should do so.  The Archdiocese is not providing individuals with religious exemption letters to avoid vaccination against COVID-19.  Please see the information and links below to understand why the Archdiocese does not consider the COVID-19 vaccine to be morally objectionable and why it encourages all the faithful to get vaccinated.

“Receiving one of the COVID-19 vaccines ought to be understood as an act of charity toward the other members of our community.  In this way, being vaccinated safely against COVID-19 should be considered an act of love of our neighbor and part of our moral responsibility for the common good.”—USCCB, Moral Considerations Regarding the New COVID-19 Vaccines.

The following links might be helpful in understanding the morality of receiving the vaccine:



Vatican:  COVID-19 vaccines are “morally acceptable”

Archdiocese of Los Angeles:  “Strongly encourages” Catholics
to receive a safe and effective COVID-19 vaccine

The Vatican’s doctrinal office, the Congregation for the Doctrine of the Faith (CDF), has determined that it is “morally acceptable” for Catholics to receive the vaccines against the COVID-19 virus.  This judgment is deeply rooted in the Catholic moral tradition.

On December 21, 2020, the CDF stated:

All vaccinations recognized as clinically safe and effective can be used in good conscience with the certain knowledge that the use of such vaccines does not constitute formal cooperation with the abortion from which the cells used in production of the vaccines derive . . . the morality of vaccination depends not only on the duty to protect one's own health, but also on the duty to pursue the common good.

In the absence of other means to stop or even prevent the epidemic, the common good may recommend vaccination, especially to protect the weakest and most exposed.

Therefore, the Archdiocese of Los Angeles strongly encourages Catholics to receive a safe and effective COVID-19 vaccine for the sake of ourselves, our loved ones, and the common good.

If some of the faithful do not receive the vaccine, the Vatican says that those persons “must do their utmost to avoid . . . becoming vehicles for the transmission of the infectious agent.”

For more information, please see the following documents from the U.S. Conference of Catholic Bishops (USCCB):

USCCB – U.S. Bishop Chairmen for Pro-Life and Doctrine

USCCB – Moral Considerations Regarding the New COVID 19 Vaccines

USCCB – Answers to Key Ethical Questions About COVID 19 Vaccines

USCCB – Moral Guidance on Vaccine

USCCB – Statement on the Johnson & Johnson COVID-19 vaccine

Please also watch the following webinar:

Webinar - “Love Your Neighbor and Get Vaccinated:  Science, Ethics and the COVID-19 Vaccines” 

The one-hour-long webinar discusses the safety and efficacy of the COVID-19 vaccines, as well as the impact the pandemic has had on parishes around the state.  If features Dr. Charles Binkley, MD, Director of Bioethics, Markkula Center for Applied Ethics at Santa Clara University; Fr. Luke Dysinger, OSB, MD, DPhil., Professor of Church History and Moral Theology, St. John's Seminary; and Mr. Isaac Cuevas, Director of Immigration and Public Affairs, Archdiocese of Los Angeles. 



COVID-19 Funeral Assistance from FEMA

FEMA (the Federal Emergency Management Agency) is providing financial assistance for funeral expenses related to COVID-19.

To be eligible for funeral assistance, you must meet these conditions:

  • The death must have occurred in the United States, including the U.S. territories, and the District of Columbia.
  • The death certificate must indicate that the death was attributed to COVID-19.
  • The applicant must be a U.S. citizen, non-citizen national, or qualified alien who incurred funeral expenses after January 20, 2020.
  • There is no requirement for the deceased person to have been a U.S. citizen, non-citizen national, or qualified alien.

To apply, please call the dedicated FEMA toll-free hotline at 844-684-6333 (Monday through Friday, 9 a.m. to 9 p.m. Eastern Time).

For more information, please go to the relevant FEMA webpage.



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