Sport/Level Years
PVAC Varsity Basketball 1998, 2003, 2007, 2019
PVAC Varsity Basketball South Division 1998, 2000, 2001, 2003, 2006, 2007, 2008, 2011, 2019
PVAC Varsity Baseball Regular Season 1999, 2000, 2001, 2002, 2004, 2006, 2012, 2017, 2018, 2019, 2022
PVAC Varsity Baseball Tournament 1999, 2003, 2004, 2006, 2008, 2010, 2011, 2017, 2018, 2019, 2022
PVAC Varsity Tennis 1999, 2000, 2001, 2002, 2022
PVAC Track & Field 2000, 2010, 2011
PVAC Swimming 2019, 2020, 2022, 2023
PVAC Cross Country 2001, 2002, 2005, 2008, 2009, 2011, 2012
PVAC Middle School Soccer 1996, 1998, 2001
PVAC Middle School Basketball 1999, 2002, 2003, 2013, 2014, 2015, 2019, 2020
PVAC Middle School Baseball 1999, 2002, 2007, 2008, 2010, 2011, 2012, 2015
PVAC JV Basketball Tournament 2004, 2007, 2022
PVAC Golf 2017, 2018, 2019, 2022
MAWL Varsity Wrestling 2006, 2007, 2008, 2009 2016, 2017, 2022, 2023
PVAC Wrestling 2020, 2022, 2023
Washington Independent Lacrosse League 2017

League championships since 1996 in the Potomac Valley Athletic Conference, the Mid-Atlantic Wrestling League and the Washington Independent Lacrosse League. Undefeated seasons are noted in bold.
St. Anselm's has hosted the longest running invitational tournament for boys in the Metropolitan DC area.

St. Anselm's won the tournament in:
1952, 1961, 1967, 1970, 1972, 1974, 1975, 1976, 1978, 1979, 1980, 1983, 1989, 1990, 2001, 2003, 2005, 2006, 2018, 2019