Type 51 may refer to:
Bugatti Type 51, motor vehicle produced by the auto-maker Bugatti Cadillac Type 51, motor vehicle produced by the auto-maker Cadillac Type 51 pistol, a variant of the Chinese Type 54 pistol Type 51, Chinese reverse-engineered copy of US M20 Super Bazooka Type 051 destroyer, Chinese navy destroyer class Type 051B destroyer, Chinese navy destroyer class