Missing NSW man may have gone swimming

AAP

A missing man who hasn't been seen since leaving a Newcastle nightclub alone may have gone swimming alone.

Jackson Baker, 20, was at a Centennary Road nightclub with his girlfriend but left around 1.30am on Thursday and hasn't been seen or heard from since.

"Police are following a number of lines of inquiry, including whether Jackson may have gone swimming alone in Newcastle Harbour in the early hours of Thursday morning," police said in a statement.