Kronshtadt (Russian: Кроншта́дт), also spelled Kronstadt, Cronstadt (German: Krone for "crown" and Stadt for "city"; Finnish: Retusaari), is a municipal town in Kronshtadtsky District of the federal city of St. Petersburg, Russia, located on Kotlin Island, 30 kilometers (19 mi) west of Saint Petersburg proper near the head of the Gulf of Finland. Population: 42,999 (2010 Census preliminary results); 43,385 (2002 Census).
It is also St. Petersburg's main seaport. In March 1921 it was the site of the Kronstadt rebellion.
Traditionally, the seat of the Russian admiralty and the base of the Russian Baltic Fleet were located in Kronstadt guarding the approaches to Saint Petersburg. The historic centre of the city and its fortifications are part of the World Heritage Site Saint Petersburg and Related Groups of Monuments.
Kronstadt has been a place of pilgrimage for Orthodox Christians for many years due to the holy memory of Saint John of Kronstadt. Bus and water tours to Kronstadt are taken daily from Saint Petersburg