
William Joseph 'Billy' Baldwin (born February 21, 1963) is an American actor, producer, and writer, known for his starring roles in such films as Flatliners (1990), Backdraft (1991), Sliver (1993), Fair Game (1995), Virus (1999), Double Bang (2001), as Johnny 13 in Danny Phantom (2004–2007), Art Heist (2004), The Squid and the Whale (2005), as Senator Patrick Darling on the ABC drama Dirty Sexy Money (2007–2009), Justice League: Crisis on Two Earths (2010), and was a regular guest on Gossip Girl as William van der Woodsen and Parenthood as Gordon Flint. He also starred as lead detective Brian Albert in the Lifetime Original Movie The Craigslist Killer.
He is brother to actors Alec Baldwin, Stephen Baldwin, and Daniel Baldwin. He is married to singer Chynna Phillips (Wilson Phillips) and they have 3 children.

Backdraft
1991 · as Brian McCaffrey

Sliver
1993 · as Zeke Hawkins

Flatliners
1990 · as Joe Hurley

Born on the Fourth of July
1989 · as Platoon - Vietnam

Forgetting Sarah Marshall
2008 · as Detective Hunter Rush

Bulworth
1998 · as Constance's Lover (uncredited)

Virus
1999 · as Steve Baker

Internal Affairs
1990 · as Van Stretch

Dino Time
2012 · as Sarco (voice)

Fair Game
1995 · as Max Kirkpatrick

Justice League: Crisis on Two Earths
2010 · as Batman (voice)

Park
2006 · as Dennis

Candy Land
2023 · as Sheriff Rex

Backdraft 2
2019 · as Brian McCaffrey

The Squid and the Whale
2005 · as Ivan

The Craigslist Killer
2011 · as Detective Bennett

Church People
2021 · as Mr. Cameron

Sexy Evil Genius
2013 · as Bert Mayfaire