- February 4, 1746: birth of Tadeusz Kościuszko a Polish and an American general, national hero of both
- March 6, 1745: birth of Kazimierz Pułaski a Polish general and American national hero
- May 3, 1791: Constitution of May 3, world's second modern constitution, is passed
- May 5, 1846: birth of Henryk Sienkiewicz, Polish Nobel Prize-winning novelist
- June 4, 1989: first partially free elections for the Sejm and free elections for the Senate after the Second World War in Poland
- August 1, 1944: Warsaw Uprising, aiming to liberate Polish capital of Warsaw from the German occupation, begins
- August 25, 1920: Battle of Warsaw ends signaling successful Polish defense of their capital in the Polish–Soviet War
- November 11, 1918: Independence Day of Poland, in commemoration of Józef Piłsudski's Proclamation of Independence in Warsaw during World War I
- December 5, 1867: birth of Józef Piłsudski, Marshal of Poland