The San Francisco Police Department, also known as the SFPD and San Francisco Department Of Police, is the police department of the City and County of San Francisco, California. The department's motto is the same as that of the city and county: Oro en paz, fierro en guerra, archaic Spanish for Gold in peace, iron in war.

The SFPD should not be confused with the San Francisco Sheriff's Department, which is another law enforcement agency within San Francisco. The SFPD (along with the San Francisco Fire Department and the San Francisco Sheriff's Department) serves an estimated population of 1.2 million, including the daytime-commuter population, and the thousands of other tourists and visitors, in the 2nd most densely populated large city in North America. It is the 11th largest police Department in the United States.