Peter Matthew Bauer is an American multi-instrumentalist, singer and songwriter. He is best known as the bass guitarist and organist of the indie rock band the Walkmen with whom he recorded seven studio albums. Prior to The Walkmen's formation, Bauer was, with Hamilton Leithauser (The Walkmen's lead vocalist), in the indie rock band The Recoys.

Following The Walkmen's decision to enter an "extreme hiatus", Bauer recorded and released his debut solo album, Liberation!, in 2014 and embarked upon a tour with The Devourers, a backing band featuring Fleet Foxes' Skyler Skjelset on guitar.

Bauer's second album, Mount Qaf, was released in 2017.