[23] The 1981 team finished the season with a 21-2 record after winning the Group IV state title with a 5-4 one-hitter against Eastside in the championship game.

[27] The 1982 team won the state title outright with a total of 2,590 pins, 44 ahead of Toms River High School North in second place.

[32] The boys soccer team won the Group IV state championship in 1996, against Randolph High School in the finals of the tournament.

[36] The field hockey team won the Central Jersey Group IV state championship in 2000, 2003, 2017 and 2019.

[37] Lenape won the 2003 Central Jersey Group IV sectional championship in field hockey, edging Cherokee High School 2–1 in the tournament final.

[39] The boys basketball team won the Group IV state championship in 2004 (defeating runner-up Plainfield High School in the final game of the tournament) and 2009 (vs. Paterson Eastside)[40] The 2004 boys' basketball won the South Jersey, Group IV championship, defeating Atlantic City High School 66–51.

[44] The girls' soccer team won the South Jersey Group IV title in 2004 with a 3–1 win over Washington Township High School.

[45] In 2007, the team won the South, Group IV state sectional championship with a 3–2 win over Toms River High School North in the tournament final.

[48][49][50] Lenape girls soccer team won the 2008–09 state championship against Ridge High School, 1–0 to top off a perfect season at 25–0–0.

Class of 2011 member Anthony Scerati averaged 235.67 during the season, which included a perfect 300 game, and an 803 series.

[57] In fall 1996, the Lenape football team pulled off the biggest upset in South Jersey football history by defeating Washington Township High School, the top-ranked team in South Jersey and top five in the state, coming back from 14-2 to win 21-14.

[citation needed] In the fall of 1997 Lenape won the Olympic Conference in football and spent most of the season ranked #1 in South Jersey.

The team won its first state sectional title, defeating Rancocas Valley Regional High School in the 2017 South Jersey Group V state sectional championship game on a field goal scored with five seconds on the clock to give top-seeded Lenape the 10-7 win over the Rancocas Valley Regional High School, the tournament's second seed.

[62] In 2018 the team won the "Engineering Inspiration Award" at the Westtown competition, as well as the runner up equivalent at the Mid-Atlantic District Championship.

In addition the school allows any club to be created as long as the student with the idea finds an interest and a teacher to supervise.

The Lenape High School Marching Band has won multiple championships in State and National competitions.

In 2008, they once again, became the Group II A Class All-States Champions with a score of 94.1, with their show entitled "I Write the Songs," a tribute to Barry Manilow.

In 2010, the marching band held on to their title as NJ State Champions in the USSBA circuit's 2A group with their show "It's About Time."

Due to scheduling conflicts with the All States Championships for 2A, the band opted to move up a group to 3A and performed in Allentown where they came in at a respectable fifth place and took the High Visual award.

In 2011, with their show "True Colors", the marching band finished an undefeated season by retaining their title as USSBA Group 2A NJ State Champions for the third consecutive year, and by winning the USSBA Group 2A National Championship with the highest score in the band's history 96.413.

In 2014, with "It's A Jungle Out There" show, the band completed an undefeated season with the USBands Group 2 OPEN New Jersey state championship and the National Title with a new best high score of 96.425.

In 2015, with "Desert Winds", Lenape won the USBands Group 2 Open New Jersey State Title and placed second at the National Championships.

In 2017, Lenape's marching band again won the USBands Group 2 Open New Jersey State Title with their show "Abracadabra."