The
Norwood Mustangs are a member of the
Tri-Valley League, a league within the
Massachusetts Interscholastic Athletic Association. They have a traditional rivalry with
Dedham High School and
Walpole High School. In 2016, Norwood explored a move to the Tri-Valley League, similar to Dedham's move after the 2015–16 academic year. Norwood had the second-smallest enrollment of BSC schools during the 2015-16 year with 967, less than half of the largest schools in the conference. In October 2017, Norwood's move to the TVL became official. The 2017–2018 school year was the 60th and final season for Norwood's membership in the
Bay State Conference.
Thanksgiving Day football rivalry Dedham High School began playing Norwood High School in an annual football contest in 1920. In 1956, seven boys from Norwood High School threw bottles of blue and white paint, the school colors, through the windows of
Dedham's School Department administration building to celebrate their team's win the day before. ==Notable alumni==