Arabian Crosses, also called Part-Arabians or Half-Arabians, represent purposeful breeding between purebred Arabian horses and other breeds, combining Arabian refinement, endurance, and intelligence with characteristics from Quarter Horses, Thoroughbreds, Welsh Ponies, draft breeds, and numerous others. The Arabian Horse Association recognizes these crosses through Half-Arabian and Anglo-Arabian divisions, registering horses with documented Arabian heritage meeting minimum percentage requirements. Half-Arabians must be 50-99% Arabian blood, while Anglo-Arabians specifically cross Arabians with Thoroughbreds in varying percentages. Other registries including the International Arabian Horse Association also maintain records for Arabian crosses.
Common terminology varies by specific cross and region. "Half-Arab" typically indicates approximately 50% Arabian breeding, while "Part-Arab" encompasses any Arabian cross regardless of percentage. Specific crosses often have recognized names—Quarab (Quarter Horse-Arabian), Morab (Morgan-Arabian), Walkaloosa (Tennessee Walker-Appaloosa with Arabian), and numerous others. Some crosses become popular enough to establish their own breed registries, while others remain simply Arabian crosses without separate breed designation. The scientific classification is Equus ferus caballus, shared with all domestic horses, though Arabian Crosses represent intentional breeding programs rather than distinct breeds.
Historically, Arabian blood has been used to refine countless horse breeds worldwide, with Arabian crosses serving practical purposes from creating cavalry mounts to developing ranch horses. In America, crossing Arabians with stock horses produces versatile ranch and trail horses combining Arabian endurance with Quarter Horse cow sense and calm temperament. Arabian-draft crosses create larger, heavier horses maintaining Arabian quality while adding size and bone for driving or riders preferring substantial mounts. Arabian-Welsh crosses produce outstanding children's ponies combining Welsh sensibility with Arabian beauty and athleticism. Modern breeding continues these traditions, with owners crossing Arabians to address specific needs—adding size, moderating temperament, introducing color patterns, or combining complementary strengths from different breeds into practical, versatile horses suited to contemporary equestrian pursuits.

