The 6-foot-9, 220-pound Canadian big man averaged 11.5 points, 10.2 rebounds and 3.8 blocks last season.
Birch began his college career at Pittsburgh and played 10 games before transferring to UNLV.
According to several NBA executives, Birch is a likely second-round pick.
Birch took to Twitter to make his announcement.
After careful consideration with my family Coach Rice and inner circle I've decided to declare for the 2014 NBA draft #rebel4Life
- Khem Birch (@MTLsGift) April 24, 2014