The Detroit Department of Transportation (DDOT) is the primary public transportation operator serving Detroit, Michigan. In existence since 1922, DDOT is a division of the city government, headed by a director appointed by the mayor. Primarily serving Detroit and its enclaves, DDOT is supplemented by suburban service from the Suburban Mobility Authority for Regional Transportation (SMART). In 2023, the system had a ridership of 11,048,700, or about 38,900 per weekday as of the fourth quarter of 2023.

The government of Detroit, Michigan is run by a mayor, the nine-member Detroit City Council, the eleven-member Board of Police Commissioners, and a clerk. All of these officers are elected on a nonpartisan ballot, with the exception of four of the police commissioners, who are appointed by the mayor. Detroit has a "strong mayoral" system, with the mayor approving departmental appointments. The council approves budgets, but the mayor is not obligated to adhere to any earmarking. The city clerk supervises elections and is formally charged with the maintenance of municipal records. City ordinances and substantially large contracts must be approved by the council.