Peter Vack
- Birthday: 1986-09-19
- Place of birth: New York City, New York, USA
- Also know as: Peter S. Brown
Peter S. Brown (born September 19, 1986), better known by his stage name Peter Vack, is an American actor, writer, director and producer. He portrayed Jason Strider in the MTV comedy series I Just Want My Pants Back (2011–2012), and Alex Merriweather in the Amazon Video comedy-drama series Mozart in the Jungle (2014–2015). Vack also voiced antagonist Gary Smith in the Rockstar Games video game Bully. In 2017, he released his feature directorial debut, Assholes.
