Tadeusz Zieliński

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