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Rev. Brian L. Costello

Deceased: 2020-07-11


ICTE Spring: 2018


Fr. Brian Costello was born June 2, 1953, in Oakland, CA. Passed away from cancer (peacefully) July 11, in Daly City, CA. Predeceased by his parents, James and Eileen Costello. he leaves behind his Brothers, James Barry Costello (Dinah), Bruce Costello and Sister, Sally Costello, as well as numerous beloved cousins. Attended St. Elizabeth’s and Our Lady of Mercy Grammar Schools, St. Joseph’s Seminary High School, San Francisco State University, Graduate Theological Union (Berkeley) and St. Patrick’s Seminary. On June 10, 2020, he celebrated the 20th Anniversary of his Ordination to the Priesthood.

Fr. Brian was a teacher for many years, at high schools in the Bay Area (Mitty, Bellarmine and later, Marin Catholic) and in Southern California (Alemany High School). He served at a number of Bay Area parishes. After Ordination, his first assignment was at St. Anthony’s of Padua in Novato. St. Anthony’s brought Brian together with two priests who became tremendous mentors and friends, Fr. Kevin Gaffey and Fr. James O’Malley. He served at St. Charles, San Carlos. He later went on to become Pastor at Mater Dolorosa, in South San Francisco, Star of the Sea and Most Holy Redeemer, in San Francisco and most recently, Our Lady of Loretto, in Novato. Fr. Brian loved sports, music, books and travel but his greatest joy came from being a priest. He was happiest when conducting Mass, interacting with parishioners and especially, the children in the elementary school. He got such a kick out of some of the answers the kids would give when he would quiz them in Religion class. Fr. Brian first and foremost, saw the good in people. He had a big heart, a wonderful smile and an infectious laugh. His motto always was “to keep it simple.” He will be deeply missed by his family and all those whose lives he touched with his kindness and generosity.

An Outdoor Parish Visitation will be held Monday, July 20th, 4:00pm-6:30pm followed by an invitation only Funeral Mass at 7:00pm (sign up at at Our Lady of Loretto Church, 1806 Novato Blvd., Novato. The service will be live streamed at

A Mass of Christian Burial will be celebrated at Our Lady of Mercy Church, One Elmwood Dr., Daly City, Tuesday, July 21st, at 11:00am. Due to Covid-19, friends are invited to attend the funeral mass via the internet at Interment Holy Cross Catholic Cemetery. In lieu of flowers, please consider a contribution to Shriners Hospitals or a charity of your choice.