What's Happening or What's Happenin' may refer to:
- What's Happening (album), by Katalyst, 2007
- What's Happening? (EP), by B1A4, 2013
- What's Happening!!, an American television sitcom that aired on ABC from 1976 to 1979
- What's Happening Now!!, a sequel that first aired on ABC from 1985–1988
- "What's Happenin!", a song by Ying Yang Twins
- "What's Happenin'", a song by Method Man from Tical 0: The Prequel, 2004
- "What's Happenin'", a song by Juvenile from Reality Check, 2006
- "What's Happening?!?!", a song by the Byrds from Fifth Dimension, 1966
- What Happened (disambiguation)
- "What Is Happening", a song by Alphabeat from their self-titled album (2007)