- Source: 2021 Williams Ephs football team
The 2021 Williams Ephs football team was an American football team that represented Williams College as a member of the New England Small College Athletic Conference (NESCAC) during the 2021 NCAA Division III football season. In their 12th year under head coach Mark Raymond, the Ephs compiled a 9–0 record and won the NESCAC championship. It was the first 9–0 season in Williams College history.