The Steinert High School Spartans[2] compete in the Colonial Valley Conference, which is comprised of public and private high schools in the Mercer County area and operates under the supervision of the New Jersey State Interscholastic Athletic Association.

[21] The 1978 team finished the season at 20-4 after winning the Group III state title by defeating Teaneck by a score of 9–0 in the championship game.

[23] The 1996 team finished the season with a 24–5 record after winning the Group III title after defeating Nutley by a score of 4–3 in the championship game.

[24] A 3–0 win against Bloomfield gave the 2000 team the Group IV state title and a 30–2 record for the season.

[27] In 2007, the field hockey team won the Central Jersey, Group IV state sectional championship with a 1–0 win over Toms River High School South in the tournament final.

[31] The girls soccer team won the Group III state championship in 1988, defeating runner-up Indian Hills High School in the finals.

[32] In 2007, the team won the Central, Group IV state sectional championship with a 1–0 win over Jackson Memorial High School in the tournament final.

[35] The girls' softball team won the 2004 NJSIAA Group IV state championship against Clifton High School.

[36] The team won the 2016 Group III state title with a 6–2 win against Middletown High School South in the tournament's final round.