"Someone You Used to Know" is a song written by Tim Johnson and Rory Lee Feek, and recorded by American country music singer Collin Raye. It was released in August 1998 as the second single from his CD The Walls Came Down. The song peaked at #3 on the U.S. Billboard country music charts and #5 on the Canadian RPM Country Tracks. It also peaked at #37 on the Billboard Hot 100 becoming Raye's biggest crossover hit.