The NCAA Division II men's basketball tournament (officially styled by the NCAA as a "Championship" instead of a "Tournament") is an annual championship tournament for colleges and universities that are members of NCAA Division II, a grouping of schools in the United States (plus one school in Canada) that are generally smaller than the higher-profile institutions grouped in Division I.

Like all other NCAA basketball divisions for men and women, the champion is decided in a single-elimination tournament.

The bids are allocated evenly among the eight NCAA-designated regions (Atlantic, Central, East, Midwest, South, South Central, Southeast, and West), all but one of which contain three of the 23 Division II conferences that sponsor men's basketball.

Each regional tournament involves an appropriate number of automatic qualifiers (teams that won their respective conference tournaments), with the remaining participants entering via at-large bids (which are awarded regardless of conference affiliation).

Schools in italics are, as of the upcoming 2024–25 Division II basketball season, no longer members of that specific conference.