Mates of State are an American indie pop duo, active since 1997. The group is composed of the husband-and-wife team of Kori Gardner (vocals, organ, synthesizer, piano, electric piano, and occasional guitar) and Jason Hammel (vocals, drums, percussion, and occasional synthesizer).

During the course of the band's career, they've released three EPs and seven full-length, studio albums. Their most recent album Mountaintops was released on September 13, 2011.