Alfred Viola (June 16, 1919 – February 21, 2007) was an American jazz guitarist who worked with Frank Sinatra for 25 years and also played the mandolin on the soundtrack of the film The Godfather.

Viola grew up in an Italian family in Brooklyn, and learned to play the guitar and mandolin as a teenager. He enlisted in the Army during World War IIfrom 1942 to 1945 and played in an Army jazz band. After he was discharged in 1946, he and Page Cavanaugh, whom he had met while serving in the Army, along with joined bassist Lloyd Pratt, formed a trio. The ensemble appeared in several films, including the Doris Day vehicle Romance on the High Seas, and played a few dates in 1946 and 1947 with Frank Sinatra. Viola continued to work with Sinatra regularly, accompanying him on several hundred studio recordings and concert dates between 1956 and 1980.

Viola was a highly regarded session musician in Los Angeles, performing in films, on television and in commercial spots. His mandolin playing can be heard on the soundtrack of The Godfather; other credits include West Side Story and Who’s Afraid of Virginia Woolf?. He continued playing jazz as well, with Bobby Troup, Ray Anthony, Harry James, Buddy Collette, Stan Kenton, Gerald Wilson and Terry Gibbs. He also worked as a session musician on over 500 albums, including releases by Jimmy Witherspoon, Helen Humes, June Christy, Natalie Cole, Neil Diamond, Ella Fitzgerald, Marvin Gaye, Steve Lawrence, Julie London, Anita O’Day, Nelson Riddle, Linda Ronstadt and Joe Williams.