Police say Ian Burnet, 22, has been missing since December 30.
The Virginia Commonwealth University student was last seen leaving his friend's apartment on West 139th Street.
He didn't say where he was going.
He was last heard from later that afternoon when he texted his friend.
Police have since found his cell phone but there's been no sign of him.
Anyone with information on the case should contact the Crime Stoppers hotline at 1-800-577-TIPS, or text CRIMES and then enter TIP577, or visit www.nypdcrimestoppers.com.