Tadeusz Jacek Zieliński (born 1966 in Katowice) is a Polish lawyer and Protestant theologian, professor of theological sciences and Juris Doctor.

Tadeusz Jacek Zieliński graduated from the University of Silesia in Katowice where he received M.A.

At the Law and Administration Faculty of the University of Warsaw he received Doctorate in Juridicial Sciences.

In 2015 President of the Republic of Poland granted him full professorship in theological sciences.

[3] He served as president of the Polish Association of Church-State Law (2008-2016).