Mozhaysk is a town and the administrative center of Mozhaysky District in Moscow Oblast, Russia, located 110 kilometers (68 mi) to the west of Moscow, on the historic road leading to Smolensk and then to Poland. Population: 31,363 (2010 Russian census); 31,459 (2002 Census); 30,735 (1989 Soviet census).

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.