The 1983 ECAC South men's basketball tournament (now known as the Colonial Athletic Association men's basketball tournament) was held March 10–12 at the Robins Center in Richmond, Virginia.
The champion, James Madison, received an automatic bid to the 1983 NCAA tournament; it was JMU's third-ever NCAA Tournament berth.
The runner-up, William & Mary, received an at-large bid to the 1983 National Invitation Tournament; it was W&M's first-ever postseason berth of any kind.