The Seattle Police Department (SPD) is the principal law enforcement agency of the city of Seattle, Washington, United States, except for the campus of the University of Washington, which is under the responsibility of its own police department.

A police motorcycle is a motorcycle used by police and law enforcement. They may be custom designed to meet the requirements unique of a particular use. Units that use motorcycles are often called motorcycle units or motor units, and police officers assigned to these units are known as motorcycle officers or motor officers.