The 2020–21 Atlantic Coast Conference men's basketball season began with practices in October 2020, followed by the start of the 2020–21 NCAA Division I men's basketball season in November. Conference play started in December 2020 and will concluded in March with the 2021 ACC men's basketball tournament at Greensboro Coliseum in Greensboro, North Carolina. The season marked the 67th season of Atlantic Coast Conference basketball. The Virginia Cavaliers won the regular season title with a conference record of 13–4. Georgia Tech won the ACC tournament over Florida State.