Gregory M. Guidry (January 23, 1950 – July 28, 2003), better known as Greg Guidry was an American singer-songwriter.

Born in St. Louis, Missouri, he played piano and sang gospel as a child, and sang in a band with future Doobie Brother Michael McDonald as a teenager. He signed a publishing contract with CBS Records in 1977 and wrote songs for Climax Blues Band, Robbie Dupree, Exile, Johnny Taylor, Sawyer Brown, and Reba McEntire. In 1981 he sang as a backing vocalist for the Allman Brothers Band on their 1981 album Brothers of the Road. He signed with Columbia in 1982 and released an album, Over the Line, which produced two hit singles, "Goin' Down" (US #17, US AC #11) and a duet with his sister Sandy, "Into My Love" (US #92).