"Ain't That Peculiar" is a 1965 song recorded by the American soul musician Marvin Gaye for the Tamla (Motown) label.

"Ain't That Peculiar" features Gaye, with the Andantes on backing vocals, singing about the torment of a painful relationship.

Billboard said that "penetrating hard-drive dance beat backs another soulful, first-rate Gaye performance.

"[1] Cash Box described it as a "rollicking, rhythmic pop-blues romantic handclapper about a love-struck fella who can't get along without his gal.

Hard rock band Diamond Reo from Pittsburgh, Pennsylvania released their version of "Ain't That Peculiar" in early 1975.