The Houston Police Department is trying to determine who was the target after gunfire erupted at the club on Fulton near Berry at about 4 a.m.
Three people, including two men and a woman, were reportedly shot.
They were taken to the hospital and are expected to be OK.
Police said it all happened when there was an argument inside the club, and the suspect pulled out a gun and opened fire.
A security guard was able to quickly get the suspected shooter into custody and hold him until officers arrived.
HPD said it's unclear whether the people shot were the intended targets.
The shooting is still under investigation.