A draft horse (US), draught horse (UK) or dray horse (from the Old English dragan meaning to draw or haul; compare Dutch dragen meaning to carry), less often called a work horse or heavy horse, is a large horse bred for hard, heavy tasks such as ploughing and farm labor. There are a number of different breeds, with varying characteristics but all share common traits of strength, patience, and a docile temperament which made them indispensable to generations of pre-industrial farmers.

Draft horses and draft crossbreds are versatile breeds used today for a multitude of purposes, including farming, show, logging, recreation, and other uses. They are also commonly used for crossbreeding, especially to light riding breeds such as the Thoroughbred for the purpose of creating sport horses. While most draft horses are used for driving, they can be ridden and some of the lighter draft breeds are capable performers under saddle.