1999 Big 12 men's basketball tournament

The 1999 Phillips 66 Big 12 men's basketball tournament was the postseason men's basketball tournament for the Big 12 Conference. It was played from March 4–7 at Kemper Arena in Kansas City, Missouri. No. 3 seed Kansas defeated 53–37 to win the championship and receive the Big 12's automatic bid to the 1999 NCAA tournament.

Seeding
The Tournament consisted of a 12 team single-elimination tournament with the top 4 seeds receiving a bye.

All-Tournament Team
Most Outstanding Player – Jeff Boschee, Kansas