Studio One is an American radio–television anthology series, created in 1947 by Canadian director Fletcher Markle, who came to CBS from the CBC.

In 1948, Markle made a quantum leap from radio to television. Sponsored by Westinghouse Electric Corporation, the television series was seen on CBS (which Westinghouse owned between 1995 and 2000), from 1948 through 1958, under several variant titles: Studio One Summer Theatre, Studio One in Hollywood, Summer Theatre, Westinghouse Studio One and Westinghouse Summer Theatre. It was telecast in black-and-white only.