Ray Rennahan, A.S.C. (b. May 1, 1896 in Las Vegas, Nevada – d. May 19, 1980 in Tarzana, California) was a movie cinematographer.

For his work in movies, he became one of the only six cinematographers to have a "Star" on the Hollywood Walk of Fame. The other five are: Haskell Wexler, Conrad L. Hall, J. Peverell Marley, Leon Shamroy and Hal Mohr.

He won two Academy Awards for Color Cinematography, for Gone with the Wind in 1940, and Blood and Sand in 1942. He was also nominated in that category for Drums Along the Mohawk in 1940, Down Argentine Way and The Blue Bird in 1941, Louisiana Purchase in 1942, For Whom the Bell Tolls in 1944, and Lady in the Dark in 1945.