The term rex rabbit refers informally to one of at least eight breeds of domestic rabbit. One such breed is the Rex, which is recognized by the American Rabbit Breeders Association (ARBA) and by the British Rabbit Council (BRC). Other modern-day rex rabbit breeds are listed below. Care must be taken to distinguish the rex rabbit breeds from the three types of rex rabbit fur for which they are known.

The domestic rabbit is the domesticated form of the European rabbit, a member of the lagomorph order. A male rabbit is known as a buck, a female is a doe, and a young rabbit is a kit. There are hundreds of rabbit breeds, originating from all over the world.