2004 Ohio Valley Conference men's basketball tournament

The 2004 Ohio Valley Conference men's basketball tournament was the postseason men's basketball tournament of the Ohio Valley Conference during the 2003–04 NCAA Division I men's basketball season. It was held March 2–6, 2004. The first round was hosted by the higher seeded team in each game. The semifinals and finals took place at Nashville Municipal Auditorium in Nashville, Tennessee.

Second-seeded Murray State won the tournament, defeating in the championship game, and received the Ohio Valley's automatic bid to the NCAA tournament. Cuthbert Victor of Murray State was named the tournament's most valuable player.

Format
The top eight eligible men's basketball teams in the Ohio Valley Conference receive a berth in the conference tournament. After the regular season, teams were seeded by conference record.