Frank Herbert Johnson (born July 22, 1942) is a retired American professional baseball player.

Primarily an outfielder and third baseman, he had a 13-season career that included one full season (1968) and parts of five others (1966–1967; 1969–1971) with the San Francisco Giants of Major League Baseball.

He threw and batted right-handed, stood 6 feet 1 inch (1.85 m) tall and weighed 155 pounds (70 kg) during his active career.

Johnson batted over .290 in four of his first seven seasons in minor league baseball, and had late-season trials with the Giants in both 1966 and 1967.

His MLB career coincided with the final years of the Willie Mays era, when the Giants also featured such young outfielders as Jesús Alou, Bobby Bonds, Ollie Brown, George Foster, Jim Ray Hart and Ken Henderson.