The Delsea Regional High School Crusaders compete as one of the member schools in the
Tri-County Conference, which is comprised of public and private high schools located in
Camden,
Cape May,
Cumberland, Gloucester and
Salem counties. The conference is overseen by the
New Jersey State Interscholastic Athletic Association (NJSIAA). With 783 students in grades 10–12, the school was classified by the NJSIAA for the 2019–20 school year as Group III for most athletic competition purposes, which included schools with an enrollment of 761 to 1,058 students in that grade range. The football team competes in the Independence Division of the 94-team
West Jersey Football League superconference and was classified by the NJSIAA as Group III South for football for 2024–2026, which included schools with 695 to 882 students. Delsea was recognized by the NJSIAA as Group III winner of the 2009-10 ShopRite Cup, achieving first-place finishes in girls cross-country, football, both girls and boys indoor relays, girls indoor track and field, girls outdoor track and field, second place boys outdoor track and field, third-place finishes in softball (tied) and boys indoor track and field, with the addition of three points awarded for having no disqualifications during the winter season. The NJSIAA recognized Delsea again in 2010-11 as winner of the ShopRite Cup for Group III, awarded for first-place finishes in indoor track & field relays for both boys and girls, indoor group track & field for both boys and girls, and in girls outdoor track & field, second in football, third in wrestling (tied) and fourth place in girls cross-country, along with six additional points for having no disqualifications for the winter and spring seasons. The baseball team won the South Jersey Group II title in 1961 and the South Jersey Group I title in 1962. The team won the South Jersey Group III championship in 2005 with an 8–6 win against
Lower Cape May Regional High School. The football team won the South Jersey Group II state sectional championships in 1976, 1982, 1984, 1986, 2008 and 2009, in addition to winning in Group III in 1979, 2000, 2005, 2012-2015 and 2017. The 1976 team finished the season with an 11–0 record after winning the South Jersey Group II sectional title with a 14–6 victory against
Pleasantville High School in the playoff finals. A late touchdown gave the 1982 team a 20–12 win against
Salem High School in the South Jersey Group II sectional championship game and a 10–0–1 record for the season. A 22–6 win against
Woodstown High School in the championship game gave the 1984 team the South Jersey Group II title and a 10–1 record, with Delsea's only loss of the season coming six weeks earlier against Woodstown. The 1986 team finished the season with a 10–1 record after winning the South Jersey Group II state sectional championship with a 16–13 win against
Clearview Regional High School in the tournament final. Despite playing no home games all season, the team finished the 2000 season with a record of 11–1, defeating
Ocean City High School by a score of 35–22 to win the South Jersey Group III championship at
Rowan University. The 2005 football team won the South, Group III state sectional title with a 21–6 win against
Lacey Township High School. The 2008 Football team won the South Jersey, Group II title with a win over
West Deptford High School by a 17–14 margin, after entering the final quarter down by a touchdown, and scoring 10 points to take the lead, capped off by the winning field goal which was kicked as the game ended. The 2009 football team went 11–1, won the South Jersey Group II title with a 40–22 win over
Haddonfield Memorial High School and set the South Jersey all-time scoring record for points in a season with 510, breaking the record of 506 that had been set by
Paulsboro High School in 2001. The team won its fourth consecutive title in 2015 with a 21–12 win against
Camden High School in the South Jersey Group III tournament final. The team won the South Jersey Group III sectional championship in 2017, the program's 14th championship, with a 29–28 win in the playoff finals against second-seeded
Woodrow Wilson High School, giving Delsea Coach Sal Marchese his 200th career victory. The wrestling team won the South Jersey Group II sectional title in 1984, 1985, 1989–1991, 2008, 2009 and 2011–2014, and won the South Jersey Group III title in 2002 and 2015–2020. The team won the Group II state championship in 1991 and the Group III title in 2015. The boys' basketball team won the Group II state title in 1991, defeating runner-up
Hillside High School in the finals of the tournament. Delsea won the girls' Group III state soccer championship in 1993 with a win in the tournament final over
Ramsey High School. The 1994 girls' basketball team won the Group III state championship with a 53–42 victory against
Morris Knolls High School in the final of the tournament. The team advanced to the
Tournament of Champions as the number-five seed and defeated fourth-seeded
Middle Township High School by a score of 52–46 in the quarterfinals and beat top-seed
Linden High School 55–54 in the semifinals before falling by a score of 52–45 to third-seed
Mount Saint Dominic Academy in the finals. The girls' cross country team won the Group II state championships in 2009. The girls team won the NJSIAA spring / outdoor track Group II title in 2010 and in Group III in 2011. The boys' track team won the Group II indoor relay championships in 2010, 2011 and 2020. The girls track team won the Group II indoor title in 2010-2012 and 2014. The boys' track team won the South Jersey, Group III sectional championship in 2017. The boys indoor / winter track team won the Group II state championship in 2011, 2018, 2020 and 2022. The boys spring / outdoor track team won the state championship in Group III in 2018 and 2022, and won the Group II title in 2019. == Administration ==