Tadeusz Zieliński may refer to: Tadeusz J. Zieliński (born 1966), Polish lawyer and Protestant theologian Tadeusz Stefan Zieliński (1859–1944), Polish philologist and historian Tadeusz Zieliński (athlete) (1946–1977), Polish middle-distance runner Thaddeus Zielinski (1916–1990), American bishop Tadeusz Zieliński (1926-2003), Polish academic and candidate for President