John George Agar Jr. was an American film and television actor. He is best known for starring alongside John Wayne in the films Sands of Iwo Jima, Fort Apache, and She Wore a Yellow Ribbon. In his later career he was the star of B movies, such as Tarantula!, The Mole People, The Brain from Planet Arous, Revenge of the Creature, Flesh and the Spur and Hand of Death. He was the first husband of Shirley Temple.

Sands of Iwo Jima is a 1949 war film starring John Wayne that follows a group of United States Marines from training to the Battle of Iwo Jima during World War II. The film, which also features John Agar, Adele Mara and Forrest Tucker, was written by Harry Brown and James Edward Grant, and directed by Allan Dwan. The picture was a Republic Pictures production.