The South Amboy Middle High School Governors (or Guvs) compete in the
Greater Middlesex Conference, which is comprised of public and private high schools located in the greater Middlesex County area, and operates under the supervision of the
New Jersey State Interscholastic Athletic Association (NJSIAA). With 210 students in grades 10–12, the school was classified by the NJSIAA for the 2019–20 school year as Group I for most athletic competition purposes, which included schools with an enrollment of 75 to 476 students in that grade range. The school participates in joint cooperative field hockey and football teams with
Sayreville War Memorial High School as the host school / lead agency. These co-op programs operate under agreements scheduled to expire at the end of the 2023–24 school year. The boys' basketball team won the Group II state championship in 1939 (defeating
Wildwood High School in the tournament final) and won the Group I title in 1963 (vs.
Wood-Ridge High School). The 1939 came back in the fourth quarter to defeat Wildwood for the Group II title and was presented the championship trophy by former Governor Harold Hoffman, the school's namesake. In 1963, the team defeated Wood-Ridge 63–60 in overtime to win the Group I state championship game in front of a crowd of 5,000 at
Convention Hall in
Atlantic City. The 1984 baseball team won the Group I state title with a 3–0 victory against
Emerson Junior-Senior High School in the championship game, to finish the season 19–3. The girls' basketball team won the Group I state championship in five consecutive seasons, in 1985 (defeating
New Providence High School in the tournament final), 1986 and 1987 (vs.
Waldwick High School both years), 1988 (vs.
Roselle Park High School) and 1989 (vs.
University High School); the five state titles are tied for tenth-most in the state and the five consecutive titles are the second-longest streak in the state. The team won their second consecutive Group I title in 1987 with a 73–29 win in the championship game against Waldwick. Despite being one of the smallest high schools in New Jersey, the 1989 team set a state record with their fifth consecutive group title, before being awarded the sixth and lowest seed in the
Tournament of Champions, where they defeated third-seeded
Bishop Eustace Preparatory School 74–61 in the first round and then second-seed
Pascack Valley High School by a score of 45–43 in the semifinals before a 45–43 overtime win against fourth-seeded
Union Catholic Regional High School in the finals. For their accomplishments, the team was inducted into the NJSIAA Hall of Fame in 2015. The 1986 softball team finished the season with a record of 19-0-1 after winning the Group I state championship in with a 10-2 one-hitter against
Pompton Lakes High School in their first and only playoff final to date. == Administration ==