A Boy and His Dog is a 1946 American Technicolor short drama film directed by LeRoy Prinz. It won an Oscar at the 19th Academy Awards in 1947 for Best Short Subject (Two-Reel).

Short-story author Samuel A. Derieux, who died twenty-four years earlier in 1922, received story credit for the film, suggesting to some the expectation that he wrote a work with the title "A Boy and His Dog". However, a plot summary for the film, attributed to David Glagovsky, closely parallels Derieux's short story "The Trial in Tom Belcher's Store", suggesting the film-makers drew on the published (and once celebrated) story, but gave the film a title Derieux need not ever have considered.

It is entirely unrelated to Harlan Ellison's 1969 novella cycle as well as its 1975 film adaptation of the same name.