Mozhaysky District is an administrative and municipal district (raion), one of the thirty-six in Moscow Oblast, Russia. It is located in the west of the oblast and borders with Smolensk Oblast in the west, Kaluga Oblast in the south, Shakhovskoy District in the north, Volokolamsky District in the northeast, Ruzsky District in the east, and with Naro-Fominsky District in the southeast. The area of the district is 2,627.28 square kilometers (1,014.40 sq mi). Its administrative center is the town of Mozhaysk. Population: 72,745 ; 70,303 (2002 Census); 42,593 (1989 Soviet census). The population of Mozhaysk accounts for 43.1% of the district's total population.

Moscow Oblast is a federal subject of Russia. With a population of 8,524,665 living in an area of 44,300 square kilometers (17,100 sq mi), it is one of the most densely populated regions in the country and is the second most populous federal subject. The oblast has no official administrative center; its public authorities are located in Moscow and Krasnogorsk, and also across other locations in the oblast.