20th Century
| Year | Date | Event |
|---|---|---|
| 1908 | September | Bezdany raid |
| 1916 | 5 November | Signing of the Act of November 5th |
| 1917 | 9 July | Oath crisis |
| 1918 | 3 March | Signing of the Treaty of Brest-Litovsk |
| 11 November | Poland regains independence | |
| 27 December | Greater Poland Uprising begins | |
| 1919 | Proclamation to the inhabitants of the former Grand Duchy of Lithuania | |
| Sejny Uprising | ||
| 26 January | Legislative election | |
| 14 February | Polish–Soviet War begins | |
| 16 February | Greater Poland Uprising ends | |
| 20 February | Adoption of Small Constitution | |
| 16 August | First Silesian Uprising begins | |
| 1920 | Signing of Treaty of Warsaw | |
| Żeligowski's Mutiny | ||
| 10 February | Poland's Wedding to the Sea in Puck | |
| July | Spa Conference | |
| 19 August | Second Silesian Uprising begins | |
| 1921 | 19 February | Signing of the Franco-Polish alliance |
| 17 March | Adoption of Mar Constitution | |
| 18 March | Signing of the Peace of Riga concludes the Polish-Soviet War | |
| 20 March | Upper Silesia plebiscite | |
| 2 May | Third Silesian Uprising begins | |
| 1922 | November | Legislative election |
| 9 December | Gabriel Narutowicz becomes President | |
| 16 December | Assassination of Gabriel Narutowicz | |
| 22 December | Stanisław Wojciechowski becomes President | |
| 1925 | 1 December | Signing of the Locarno Treaties |
| 1926 | May | May Coup |
| 4 June | Ignacy Mościcki becomes President | |
| 1928 | Legislative election | |
| 1930 | 16 November | Legislative election |
| 1932 | 25 July | Signing of the Soviet–Polish Non-Aggression Pact |
| 1934 | 26 January | Signing of the German–Polish Non-Aggression Pact |
| 1935 | Legislative election | |
| 23 April | Adoption of Apr Constitution | |
| 12 May | Death of Józef Piłsudski | |
| 1938 | Legislative election | |
| 1 April | Territorial changes of Polish Voivodeships | |
| October | Annexation of Zaolzie | |
| 1939 | 23 August | Signing of the Molotov-Ribbentrop Pact |
| 25 August | Signing of the Polish-British Common Defence Pact | |
| 29 August | Peking Plan begins | |
| 31 August | Gleiwitz incident begins | |
| 1 September | Invasion of Poland begins; Bombing of Wieluń | |
| 2 September | massacre on Torzeniec village | |
| 3 September | Bloody Sunday | |
| 9 September | German Massacre in Ciepielów on polish POW | |
| 13 September | Bombing of Frampol | |
| 17 September | Soviet invasion of Poland | |
| 18 September | Orzeł incident | |
| 6 November | Sonderaktion Krakau | |
| 1940 | 5 March | Authorization of Katyń massacre |
| 16 May | Authorization of AB Action | |
| 1941 | July | Massacre of Lwów professors |
| 10 July | Jedwabne pogrom | |
| 17 August | Signing of the Sikorski–Mayski agreement | |
| 1943 | 26 March | Operation Arsenal |
| 19 April | Warsaw Ghetto Uprising begins | |
| 16 May | Warsaw Ghetto Uprising ends | |
| 4 July | Death of Władysław Sikorski | |
| 11 July | Beginning of Massacres of Poles in Volhynia | |
| 1 December | Tehran Conference concludes | |
| 1944 | Glinciszki massacre | |
| 29 January | Koniuchy massacre | |
| 28 February | Huta Pieniacka massacre | |
| 22 July | Proclamation of the PKWN Manifesto | |
| 25 July | Operation Most III begins | |
| August | Wola massacre | |
| 1 August | Warsaw Uprising begins | |
| 2 October | Warsaw Uprising ends | |
| 1945 | 27 January | Przyszowice massacre |
| 11 February | Yalta Conference concludes | |
| March | Pawłokoma massacre | |
| 17 March | Poland's Wedding to the Sea in Mrzeżyno | |
| 18 March | Poland's Wedding to the Sea in Kołobrzeg | |
| June | Augustów chase 1945; Trial of the Sixteen | |
| 2 August | Potsdam Conference concludes | |
| 11 August | Kraków pogrom | |
| 1946 | 30 June | People's referendum |
| 4 July | Kielce pogrom | |
| 1947 | 19 January | Legislative election |
| 19 February | Adoption of Small Constitution of 1947 | |
| 28 April | Operation Vistula begins | |
| 1950 | 6 July | Signing of the Treaty of Zgorzelec |
| 1951 | Trial of the Generals | |
| 1952 | Legislative election | |
| 22 July | Adoption of Constitution of the People's Republic of Poland | |
| 1955 | 14 May | Signing of the Warsaw Pact |
| 1956 | Polish October | |
| 28 June | Poznań 1956 protests begin | |
| 1957 | Legislative election | |
| 1961 | Legislative election | |
| 1965 | Legislative election | |
| Letter of Reconciliation of the Polish Bishops to the German Bishops | ||
| 1968 | March | Political crisis |
| 20 August | End of Prague Spring with the invasion of Czechoslovakia | |
| 1970 | 7 December | Signing of Treaty of Warsaw; Warschauer Kniefall |
| 14 December | 1970 protests begin | |
| 1978 | 16 October | Election of Pope John Paul II |
| 1980 | Gdańsk Agreement | |
| 14 March | LOT Polish Airlines Flight 007 | |
| 17 August | 21 demands of MKS | |
| 1981 | 13 December | Martial law begins |
| 1983 | Solidarity leader Lech Wałęsa receives the Nobel Peace Prize. | |
| 22 July | Martial law ends | |
| 1984 | Father Jerzy Popiełuszko murdered by Polish secret police. | |
| 1989 | 4 April | Signing of the Round Table Agreement |
| 7 April | April Novelization | |
| 4 June | Parliamentary election | |
| 19 July | Wojciech Jaruzelski becomes President | |
| 31 December | The People's Republic of Poland becomes the Republic of Poland | |
| 1990 | Presidential election | |
| 27 May | Local elections | |
| 14 November | Signing of German–Polish Border Treaty | |
| 22 December | Lech Wałęsa becomes President | |
| 1991 | 27 June | Mława pogrom |
| 1 July | Dissolution of Warsaw Pact | |
| 27 October | Parliamentary election | |
| 1992 | 17 October | Adoption of Small Constitution |
| 21 December | Signing of Central European Free Trade Agreement | |
| 1993 | 14 September | Lufthansa Flight 2904 |
| 19 September | Parliamentary election | |
| 1994 | 2 May | Poland bus disaster of 1994 |
| 19 June | Local elections | |
| 1995 | November | Presidential election |
| 23 December | Aleksander Kwaśniewski becomes President | |
| 1997 | 2 April | Adoption of Constitution |
| 21 September | Parliamentary election | |
| 1998 | 11 October | Local elections |
| 1999 | 12 March | Accession of Poland to NATO |
| 2000 | 8 October | Presidential election |
Read more about this topic: Timeline Of Polish History