Tadeusz Pieronek (pronounced [taˈdɛ.uʂ pjɛˈrɔnɛk]; 24 October 1934 – 27 December 2018) was a Polish Roman Catholic auxiliary bishop-emeritus, Catholic academic and professor of theology and civil law. Pieronek was a leading member of the Stefan Batory Foundation (a George Soros Foundation branch in Poland).