The Tenafly High School Tigers compete in the Big North Conference, which is comprised of public and private high schools in Bergen and Passaic counties, and was established following a reorganization of sports leagues in Northern New Jersey by the New Jersey State Interscholastic Athletic Association (NJSIAA). Before the 2010 realignment, Tenafly competed in the Bergen County Scholastic League (BCSL) American Conference, which included public and private high schools located in Bergen and Hudson counties. With 910 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 Ivy White division of the North Jersey Super Football Conference, which includes 112 schools competing in 20 divisions, making it the nation's biggest football-only high school sports league. The football team is one of the 12 programs assigned to the two Ivy divisions starting in 2020, which are intended to allow weaker programs ineligible for playoff participation to compete primarily against each other. The school was classified by the NJSIAA as Group III North for football for 2018–2020. The name for the school's athletic teams is the Tigers, and its school colors are black and orange, adopted in the 1920s as a nod to those of Princeton University.