Smart also was one of two unanimous selections to the Big 12 All-Defensive Team.
Brown, who averages 17.2 points and 5.6 rebounds, was a second-team All-Big 12 selection for the second consecutive year. He averaged 35.1 minutes while starting all 31 games during the regular season.
Nash, averaging 14.2 points and 5.7 rebounds, earned All-Big 12 honorees for the third consecutive season with his honorable mention recognition.
Forte, who averages 13.2 points, was named the co-Sixth Man Award winner, sharing the honors with Oklahoma's Tyler Neal. He is the first Cowboy to ever receive the Sixth Man Award.
The Cowboys, 20-11, have all but locked up an at-large berth in the NCAA Tournament but will be looking to improve their resume in the Big 12 Tournament. They play Texas Tech,14-17, in a first-round game at 6 p.m. Wednesday at the Sprint Center in Kansas City.