The Lacey Township High School Lions compete in Division B 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 876 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 school was classified by the NJSIAA as Group III South for football for 2018–2020.