東京都議会
Musashimurayama has a mayor-council form of government with a directly elected mayor and a unicameral city council of 20 members. Musashimurayama, together with the cities of Higashiyamato and Higashimurayama, contributes three members to the Tokyo Metropolitan Assembly. In terms of national politics, the city is part of Tokyo 20th district of the lower house of the Diet of Japan.