John A. Alonzo, American actor and cinematographer (d. 2001)
John A. Alonzo, ASC (June 12, 1934 – March 13, 2001) was an American cinematographer, television director, and actor known for his diverse body of work in both film and television.

Alonzo pioneered handheld work, lighting techniques and high-definition video development during his career. He is remembered mainly for Chinatown (1974) and Scarface (1983), the former for which he was nominated for both a BAFTA and an Academy Award. In addition, he was the recipient of a Primetime Emmy for his work on the 2000 CBS television adaptation of Fail Safe.

Alonzo was the first American cinematographer of Mexican-American and Latino heritage to become a member of the Cinematographer's Union in Los Angeles, as well as the first to be inducted into the ASC.