Sulejówek [sulɛˈjuvɛk] is a town in Poland, about 18 km east of Warsaw city centre and part of its metropolitan area.

On August 8, 1863, the settlement of Miłosna (present-day district of Sulejówek) was attacked by Cossacks, but the surprised local Polish insurgent unit managed to escape.

[3] In revenge, the Cossacks attacked and robbed the local post office, wounded and captured the postmen, taking them to Warsaw.

In August 1920, during the Battle of Warsaw, the first line of Polish defense against the Russian invaders passed through Sulejówek, however, there was no direct fighting in this sector (see: Polish–Soviet War).

[5] In 1919, Polish composer and statesman Ignacy Jan Paderewski and his wife Helena Paderewska bought a villa ("Białynia") in Sulejówek and established an Educational Institute, which was financially supported by Marshal of Poland Józef Piłsudski.