St. Bonaventure High School athletic teams are nicknamed the
Seraphs. The school is a member of the
CIF Southern Section (CIF-SS), competing in the
Tri-County Athletic Association for all sports except football and in the
Marmonte Football Association for football. SBHS is known for its many state and section championships, particularly in football. The Seraphs girls' soccer team won CIF-SS championships in 1998 (shared with
Maranatha High School of Pasadena) and 2021. The St. Bonaventure softball team won CIF-SS titles in 2014, 2015, and 2021.
Football From 2002 to 2009, the St. Bonaventure football team competed in the
Channel League as the only private school among six members. During that time, the Seraphs won every league game. However, the team was forced to forfeit its undefeated league championship in 2009 due to the use of an ineligible player. For the 2010 season, St. Bonaventure and rival private school
Oaks Christian School were placed into the
Marmonte League for football, a grouping consisting mostly of large public schools. The Seraphs continued their success, sharing the 2010 league title with Oaks Christian and
Westlake High School, all with identical 8-1 conference records. St. Bonaventure won two
California state football championships back to back in 2007 and 2008. The Seraphs also hold ten
CIF Southern Section championships dating back to 1968. • CIF-State • Division III — 2007, 2008 •
CIF-SS — 1968 • Division XI — 1996, 1999, 2000, 2001 • Division IV — 2002, 2004, 2005 • Division III — 2007, 2008 ==Notable alumni==