Carassius is a genus in the family Cyprinidae. The species in this genus are commonly known as Crucian carps, though this term can also specifically refer to Carassius carassius. The most well known is the goldfish which was bred from the Prussian Carp.

• Goldfish, Carassius (auratus) auratus
• Prussian Carp, Carassius (auratus) gibelio
• Crucian Carp, Carassius carassius
• Japanese Crucian Carp or White Crucian Carp, Carassius cuiveri