2009 Big 12 Conference baseball tournament

The 2009 Big 12 Conference baseball tournament was held at AT&T Bricktown Ballpark in Oklahoma City, Oklahoma, United States, from May 20 to May 24, 2009. This was the fourth year the conference used the round robin tournament setup. The winners of each group at the end of the round robin faced each other in a one-game match for the championship. The Texas Longhorns defeated the Missouri Tigers, 12–7 to win the championship.

Regular Season Standings
Source:
 * Colorado and Iowa State did not sponsor baseball teams.

Tournament

 * Missouri advances due to tournament tiebreaker.
 * Texas advances due to tournament tiebreaker.
 * Oklahoma State and Nebraska did not make the tournament.