"Liar" is a song written by Russ Ballard of Argent from their 1970 self-titled debut album. It was released as the band's first single, but did not chart. A version by Three Dog Night was released the following year and was featured on the band's album, Naturally. Danny Hutton delivered the lead vocal and Richard Podolor was the producer. In the U.S., "Liar" reached #7 on the Billboard chart. In Canada, the song peaked at #4 in 1971.