Francis Augustus Hamer (March 17, 1884 – July 10, 1955) was a Texas Ranger, known in popular culture for his involvement in tracking down and killing the criminal duo Bonnie Parker and Clyde Barrow in 1934.

In a career that spanned the last days of the Wild West well into the automobile age, Hamer acquired legendary status in the Southwest as the archetypal Texas Ranger. He is an inductee to the Texas Ranger Hall of Fame.