The Immaculate Mustangs have a strong tradition of athletic excellence. 

Connecticut State Champions:

Men's Basketball (Class "S") 1976, 2012

Women's Soccer (Class"S") 1995, 2003, 2004, 2005, 2006, 2008, 2009, 2010, 2011, 2012

Men's Soccer (Class "S") 1996, 1997

Women's Lacrosse (Class "S") 2009

Men's Ice Hockey (DII) 1986, 2007

Men's Baseball (Class "S") 2001, 2003, 2004

Football (Class "S") 1986

Women's Cross Country (Class "S") 1997, 2012; Moira Kenny, 2009

Wrestling (Class "S") Julian Christe, 2007; Gavin Buckley, 2009; Justin Waltzer, 2011

Southwest Conference Champions

Men's Ice Hockey 2000, 2003, 2007

Men's Basketball 1997, 2012

Women's Soccer 1995, 2004, 2005

Women's Indoor Track 2012

Women's Cross Country 2011

Western Connecticut Conference Champions

Men's Ice Hockey 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991

Men's Basketball 1987 

Golf 1970, 1971, 1972, 1973, 1974, 1978, 1988

Baseball 1974, 1981

Softball 1981, 1991

Football 1985, 1986

Women's Basketball 1989, 1992

Cross Country 1970