The mayor of the District of Columbia is the head of the executive branch of the government of the District of Columbia. The mayor has the duty to enforce district laws, and the power to either approve or veto bills passed by the D.C. Council. In addition, the mayor oversees all district services, public property, police and fire protection, most public agencies, and the district public school system. The mayor's office oversees an annual district budget of $8.8 billion. The mayor's executive office is located in the John A. Wilson Building in Downtown Washington, D.C. The mayor appoints several officers, including the deputy mayors for Education and Planning & Economic Development, the district administrator, the chancellor of the district's public schools, and the department heads of the district agencies.

The District of Columbia has a mayor–council government that operates under Article One of the United States Constitution and the District of Columbia Home Rule Act. The Home Rule Act devolves certain powers of the United States Congress to the local government, which consists of a mayor and a 13-member council. However, Congress retains the right to review and overturn laws created by the council and intervene in local affairs.