The 2021 Great Lakes Intercollegiate Athletic Conference men's basketball tournament was a postseason men's basketball tournament for the GLIAC of the which took place March 2–5, 2021. The Semi-Finals and Finals were played in in Hammond, Indiana, with the first two rounds being held at the home stadium of the team that had the better record of their respective matchup. For example, the matchup between #3 Michigan Tech and #6 Purdue Northwest would be hosted by Michigan Tech.