On May 12, 1926, Piłsudski, prompted by mutinous units seeking his leadership and intent on preventing the three-time prime minister Wincenty Witos of the peasant Polish People's Party from forming another coalition, staged a military overthrow of the Polish government, confronting President Stanisław Wojciechowski and overpowering the troops loyal to him.

Stanisław Wojciechowski (; 1869 – 1953 ) was a Polish politician and scientist.

Stanisław Wojciechowski was born on 15 March 1869 in Kalisz, and died near Warsaw on 9 April 1953 at the age of 84.

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* Stanisław Wojciechowski, president of Poland

Grudziądz's economic potential was featured at the First Pomeranian Exhibition of Agriculture and Industry in 1925, officially opened by Stanisław Wojciechowski, President of the Second Polish Republic.

* 22 June 1924 – President of the Republic of Poland Stanisław Wojciechowski visits Brodnica

Helena, his daughter, also an artist, was a patriot who helped victims in World War I and was awarded the Cross of Independence by president Stanisław Wojciechowski.

The next ones to drop out were: the candidate of the united groupings of the national minorities, Jan Baudouin de Courtenay and Stanisław Wojciechowski ( supported by some part of the Left ).

On 10 February 1920, General Haller together with the Minister of Internal Affairs, Stanisław Wojciechowski, and the new administration of the Pomeranian Province came to Puck, where he performed a " symbolic wedding ceremony " of Poland and the Baltic Sea.

* Stanisław Wojciechowski ( 1869 – 1953 )-President of Poland 1922-26

* 1869 – Stanisław Wyspiański, Polish dramatist ( d. 1907 )

* November 28 – Stanisław Wyspiański, Polish writer, painter, and architect ( b. 1869 )

* Stanisław Estreicher ( 1869 – 1939 ), founder of the Jagiellonian University Museum

In 1869 a group of young conservative publicists in Kraków, including Józef Szujski, Stanisław Tarnowski, Stanisław Koźmian and Ludwik Wodzicki, published a series of satirical pamphlets entitled Teka Stańczyka ( Stańczyk's Portfolio ).

Stanisław Wyspiański (; 15 January 1869 – 28 November 1907 ) was a Polish playwright, painter and poet, as well as interior and furniture designer.

In 1869 a group of young conservative publicists: Józef Szujski, Stanisław Tarnowski, Stanisław Koźmian and Ludwik Wodzicki, published a series of satirical pamphlets entitled ( Stańczyk's Portfolio ).

* 1773 – Stanisław Konarski, Polish writer ( b. 1700 )

* 1623 – Stanisław Lubieniecki, Polish theologian, historian, astronomer, and writer ( d. 1675 )

In mathematics, the Borsuk – Ulam theorem, named after Stanisław Ulam and Karol Borsuk, states that every continuous function from an n-sphere into Euclidean n-space maps some pair of antipodal points to the same point.

* 1885 – Stanisław Ignacy Witkiewicz, Polish writer and painter ( d. 1939 )

* 1934 – Stanisław Grochowiak, Polish poet ( d. 1976 )

Janusz Andrzej Zajdel ( 15 August 1938 in Warsaw – 19 July 1985 in Warsaw ) was a prominent Polish science fiction author, second in popularity in Poland after Stanisław Lem.

* Peter Estenberg ( 1686 – 1740 ), Greek Scholar, Professor, and advisor to King Stanislaw ( Stanisław Leszczyński ) of Poland in the early 18th century.

* 1909 – Stanisław Jerzy Lec, Polish author ( d. 1966 )

* 1927 – Stanisław Kania, Polish politician

* 2006 – Stanisław Lem, Polish writer ( b. 1921 )

* 1700 – Stanisław Konarski, Polish poet ( d. 1773 )

* 1932 – Franciszek Żwirko and Stanisław Wigura, Polish Challenge 1932 winners, are killed when their RWD 6 airplane crashes during a storm.

* 1921 – Stanisław Lem, Polish author ( d. 2006 )

* 1939 – Stanisław Ignacy Witkiewicz, Polish author, painter, and photographer ( b. 1885 )

* Stanisław August Poniatowski ( 1732 – 98 ), the last king of independent Poland, a leading light of the Enlightenment in the Polish-Lithuanian Commonwealth, and co-author of one of the world's first modern constitutions, the Constitution of May 3, 1791.

* September 18 – Stanisław Ignacy Witkiewicz, Polish writer and painter ( b. 1885 )

* November 25 – Lech Wałęsa and Stanisław Tymiński win the first round of the first presidential elections in Poland.

* September 2 – Stanisław Grochowiak, Polish writer ( b. 1934 )

* March 2 – Stanisław Taczak, Polish general ( b. 1874 )

* August 23 – Stanisław Lubieniecki, Polish Socinian theologist ( d. 1675 )

* September 7 – Stanisław August Poniatowski is elected as the King of the Polish-Lithuanian Commonwealth.

* June 4 – Stanisław Moniuszko, Polish composer ( b. 1819 )

* April 8 – Stanisław Taczak, Polish general, commander-in-chief of the Greater Poland Uprising ( d. 1960 )