Horace Horsecollar is a fictional character created by Ub Iwerks for Walt Disney.

He is one of Mickey Mouse's friends and the boyfriend of Clarabelle Cow. Horace first appeared as Mickey's plough horse in The Plow Boy in 1929. Since then, he appeared as an anthropomorphic horse with the personality of a cheerful know-it-all. Horace helped Mickey on his sleuthing expeditions in the comics before Goofy was created; in recent years, Horace has more commonly appeared in day-to-day gag situations.

Horace has never really been more than a supporting character, though he has starred in numerous European comic book stories of his own. On modern television, he appeared in a few segments of Mickey Mouse Works. He also appears in Disney's House of Mouse as the club's mechanical technician.

After departing the Disney studio, Ub Iwerks created a Horace-like character, the mule Orace, for his own studio. As can be noted, even the name is almost the same.