1926 was announced
The Year of Saint Jacob
Events in Poland
1 January - Zawichost obtained city rights.
January 3 - in Katowice, the first Silesian bishop, Fr. August Hlond, later Primate of Poland.
January 6 - The Polish Literary Club appointed a commission consisting of: J. Kaden-Bandrowski, S. Krzywoszewski, J. Lorentowicz, K. Makuszyński, W. Sieroszewski and L. Staff. The commission was to carry out the project of establishing the Polish Academy of Literature.
January 7 - a former cemetery was discovered while digging up the sewers next to St. Mary's Church in Krakow. The workers extracted a few skulls and crossbones, which were transported to the Rakowicki cemetery.
January 12 - a group of PSL Liberation activists formed the Peasant Party.
January 18 - the first Polish unit arrived on board ORP Mewa to the Military Transit Depot at Westerplatte.
January 20 - Vilnius Province was created.
February 10 - The Council of Ministers issued an ordinance granting municipal rights to Gdynia, a recent fishing village.
March 4 - Gdynia was granted city rights.
March 21 - the Broń Radom sports club was established.
March 25 - Artillery Research Institute was established.
April 4 - the first issue of the Catholic periodical 'Niedziela' was published.
April 11 - the Polish Chess Federation (PZSzach) was established.
April 12 - Józef Konstanty Karśnicki became chairman of the Polish Scouting Association.
April 16 - ŁKS Łomża sports club was established
April 18 - the first Polish radio station began broadcasting on a regular basis - the current Program I of Polish Radio.
April 20 - PPS withdrew from the government coalition, unable to come to terms with Jerzy Zdziechowski's plan to save the budget at the expense of the working masses.
April 29 - Toruń's bugle-call was played for the first time.
May 5 - the government of Aleksander Skrzyński collapsed.
May 9 - in Warsaw hurdler Ludwika Gorloff set the Polish record in the 80 m run by Lt. result 14.4 s.
May 10 - the third government of Wincenty Witos was established.
May 12 - Józef Piłsudski made the May coup. Piłsudski and the troops supporting him entered Warsaw.
May 14 - May coup: in the face of the counterattack of Marshal Józef Piłsudski's troops, Polish authorities withdrew to Wilanów, where in the evening President Stanisław Wojciechowski resigned his office, and Prime Minister Wincenty Witos resigned his government. The fights in Warsaw are over.
May 15 - the government of Kazimierz Bartel was formed, and the duties of the president were taken over by the Marshal of the Sejm, Maciej Rataj.
May 23 - the first official track and field world record set by a Pole. Halina Konopacka in the discus throw gained 34.15 m.
Presidential elections: Józef Piłsudski won the vote in the National Assembly, who refused to take office.
mud gas explosion on the Dobellus Mały lakes (Kleiner Dobellus).
June 1 - another vote in the National Assembly, as a result of which Ignacy Mościcki was elected president. The day before, the assembly named Józef Piłsudski, but he refused to accept the office.
June 4 - Ignacy Mościcki was sworn in to the office of the President of the Republic of Poland.
June 5 - The City Stadium was opened in Zielona Góra.
June 12 - Marshal Józef Piłsudski received honorary citizenship of Bełchatów.
June 13 - The PPS-Left was established in Kraków.
the world premiere of Karol Szymanowski's opera King Roger took place in Warsaw.
Karol Rolle became the president of Krakow.
June 24 - The Polish Security Printing Works was established.
June 27 - in Warsaw, hurdler Stefan Kostrzewski set a Polish record in the 400 m run by Lt. - 56.8 sec.
June 29 - 41 soldiers of the Polish Army died in the crash near Powurskie.
1 July - Oliwa was incorporated into Gdańsk.