Look up Tadeusz in Wiktionary, the free dictionary.

Tadeusz is a Polish first name, derived from Thaddaeus.

Tadeusz may refer to:

• Tadeusz Bednarowicz (1906–1939), Polish footballer
• Tadeusz Bór-Komorowski (1895–1966), Polish military leader
• Tadeusz Borowski (1922–1951), Polish writer and The Holocaust survivor
• Tadeusz Boy-Żeleński (1874–1941), Polish gynaecologist, writer, poet, art critic, translator of French literary classics and journalist
• Tadeusz Brzeziński (1896–1991), Polish consular official and the father of President Jimmy Carter's national security adviser, Zbigniew Brzezinski
• Tadeusz Czeżowski (1889–1981), Polish philosopher and logician
• Tadeusz Dołęga-Mostowicz (1898–1939), Polish journalist and author of over a dozen popular novels
• Tadeusz Drzazga (born 1975), Polish weightlifter
• Tadeusz Hollender (1910–1943), Polish poet, translator and humorist
• Tadeusz Rozwadowski (1866 – 1928) was a Polish military commander, diplomat, and politician, a founder of the modern Polish Republic
• Tadeusz Kantor (1915–1990), Polish artist and theatre-maker
• Tadeusz Kassern (1904–1957), Polish composer
• Tadeusz Wladyslaw Konopka, birth name of Ted Knight (1923–1986), American actor
• Tadeusz Konwicki (1926–2015), Polish writer
• Tadeusz Kościuszko (1746–1817), Polish–Lithuanian military leader and national hero, and American Revolutionary War general
• Tadeusz Kotarbiński (1886–1981), pupil of Kazimierz Twardowski
• Tadeusz Krwawicz (1910–1988), Polish pioneer in medicine
• Tadeusz Kurcyusz (1881–1944), commandant of Narodowe Sily Zbrojne
• Tadeusz Łomnicki (1927–1992), Polish actor
• Tadeusz Michalik (born 1991), Polish Olympic bronze medalist in Greco-Roman wrestling at the 2020 Olympics
• Tadeusz Miciński (1873–1918), Polish poet and playwright
• Tadeusz Pietrzykowski (1917–1991), Polish boxer and Polish Armed Forces soldier, known as the "boxing champion of Auschwitz"
• Tadeusz Piotrowski (mountaineer) (1940–1986), mountaineer and writer
• Tadeusz Piotrowski (sociologist) (born 1940), sociologist and author of books about Holocaust and the history of Poland
• Tadeusz Rejtan (1742–1780), Polish nobleman
• Tadeusz Romer (1894–1978), Polish diplomat and politician
• Tadeusz Różewicz (1921–2014), Polish poet and writer
• Tadeusz Rut (1931–2002), Polish hammer thrower
• Tadeusz Sapierzyński (born 1958), Polish army officer
• Tadeusz Sendzimir (1894–1989), Polish engineer and inventor
• Tadeusz Swietochowski (1934–2017), American historian and Caucasologist
• Tadeusz Ślusarski (1950–1998), Polish Olympic gold medalist in pole vault at the 1976 Olympics
• Tadeusz Tański (1892–1941), Polish automobile engineer and the designer of, among others, the first Polish serially-built automobile
• Tadeusz Tomaszewski (born 1959), Polish politician, Member of the Parliament
• Tadeusz Ważewski (1896–1972), Polish mathematician
• Tadeusz Zawadzki (1921–1943), Polish anti-Nazi resistance fighter
• Tadeusz Żychiewicz (1922–1994), Polish journalist, art historian and publicist

Fictional characters

• Tadeusz Soplica, the titular character of Pan Tadeusz, an 1834 epic poem by Adam Mickiewicz