The 2013 NCAA Division III men's basketball tournament was a single-elimination tournament of 62 teams held to determine the men's collegiate basketball national champion of National Collegiate Athletic Association (NCAA) Division III.

It began on March 2, 2013, and concluded with the championship game on April 7, 2013, at Philips Arena in Atlanta as part of the festivities for the 75th anniversary of the NCAA Tournament.

[1] The Amherst Lord Jeffs defeated the Mary Hardin–Baylor Crusaders 87–70 in the championship game.

* – Denotes overtime period Unless otherwise noted, all times listed are Eastern Daylight Time (UTC-04) Due to an NCAA ban on postseason games in New Jersey, the first round match between top-seeded Ramapo and Morrisville State was held in Nyack, NY on the campus of Nyack College.

Due to an NCAA ban on postseason games in New Jersey, Stevens was unable to host its first round match between against Randolph-Macon.