Lomonosov is a municipal town in Petrodvortsovy District of the federal city of Saint Petersburg, Russia, located on the southern coast of the Gulf of Finland, 40 kilometers (25 mi) west of Saint Petersburg proper. Population: 42,505 (2010 Russian census); 37,776 (2002 Census). Lomonosov is the site of the 18th-century royal Oranienbaum park and palace complex, notable as being the only palace in the vicinity of Saint Petersburg that was not captured by Nazi Germany during World War II.

The federal city of Saint Petersburg, Russia, is divided into eighteen rayony, which are in turn subdivided into municipal okrugs, municipal towns, and municipal settlements.