"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. It was the follow-up to the biggest hit of the band's career, "Joy to the World." 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.