The Jackson Memorial High School Jaguars competed in Division A South of the
Shore Conference, an athletic conference comprised of public and private high schools in
Monmouth and Ocean counties along the
Jersey Shore. The league operates under the jurisdiction of the
New Jersey State Interscholastic Athletic Association (NJSIAA). With 1,186 students in grades 10-12, the school was classified by the NJSIAA for the 2019–20 school year as Group IV for most athletic competition purposes, which included schools with an enrollment of 1,060 to 5,049 students in that grade range. The school was classified by the NJSIAA as Group IV South for football for 2024–2026, which included schools with 890 to 1,298 students. The school participated in a joint ice hockey team with
Point Pleasant Borough High School in which
Jackson Liberty High School is the host school / lead agency. The co-op program operates under agreements scheduled to expire at the end of the 2023–24 school year. Jackson Memorial's key rivals were
Southern Regional,
Toms River South,
Toms River North,
Toms River East,
Brick Memorial and
Brick Township. ;Baseball • Team championships • Ocean County Tournament champions - 1972, 2012, 2015 • Shore Conference Tournament champions - 1984,) and 2014 (in Group IV, with a 2-0 win vs.
Roxbury High School) ;Girls basketball • Team championships • Group IV state champions - 2012 (with a 50-47 win vs.
North Hunterdon High School in the finals) ;Boys bowling • Team championships • 1975-1976 Overall state champions • Individual champions • Mike Ormsby - 2013 individual state champion • 1978 Overall state champion • 2006-2007 New Jersey state champions • Central Jersey Group IV Champions - 2006, 2007 ;Girls cross country • Team championships • Central Jersey Group IV Champions - 2004, 2005 ;Football • Team championships • South Jersey Group IV sectional champions - 2000 (finishing 12-0 after a 14-7 overtime win against
Shawnee High School in overtime) and 2001 (with a 12-0 record after a 24-0 win vs.
Cherokee High School in the finals)), 2014 and 2015. ;Boys' ice hockey • Team championships • Handchen Cup - 2017 ;Indoor relay • Team championships • Girls champion Group IV - 2003, 2005; Group III - 2016 ;Boys' soccer • Team championships • South Jersey Group IV sectional champions - 1986 & 1990 • New Jersey Group IV state champions - 1990 (defeating
Kearny High School by a score of 4-0, to finish the season 22-1) ;Boys' spring track • Team championships • 2009-2010 Ocean County champions ;Girls' spring track • Team championships • 2006 Group IV state champion ;Boys' winter track • Team championships • 2010 Group III state champions • 2010 Central Jersey Group III sectional champions ;Girls' winter track • Team championships • Group IV state championship - 2005, 2006 ;Wrestling • Team championships • Central Jersey Group IV state sectional champions - 2004-2007, 2010, 2011, 2015-2017, 2019. • Group IV state champion - 2007, 2010, 2011 ==Marching band==