Gary P. Nunn (born 1945) is a Texas Country singer/songwriter. Nunn was born in Oklahoma and moved to Brownfield, Texas as a sixth grader. He was a member of Levelland, Texas rock band The Sparkles during the 1960s. In 1995, Nunn was inducted into the West Texas Walk of Fame, and in 2004, into the Texas Hall of Fame. In 1968 he was a pharmacy major at the University of Texas at Austin. By the 1970s, Nunn was backing Jerry Jeff Walker with the Lost Gonzo Band, which parted ways with Walker in 1977, with Nunn later moving on to a solo career. Austin City Limits made the songwriter's "London Homesick Blues" its theme for more than two decades.
He also co-wrote South Canadian River Song, with Michael Martin Murphey.