Joachim Stefan Bartoszewicz (born September 3, 1867 in Warsaw, died September 23, 1938, Warsaw) - Polish National Party politician, publicist, independence activist, lawyer, doctor.
He moved to Paris to further his education, but switched from studying medicine to begin studies at the School of Political Sciences (École Libre des Scienses Politiques) at the Faculty of Diplomacy.
In the years 1906–1912, he was the editor-in-chief of the press organ of National Democracy of Poland, "Dziennik Kijowski.
He also took part in the meeting of this organization in 1912 in Pieniaki (Brody Raion) of Tadeusz Cieński.
8 from the Lublin Voivodeship (province) on behalf of the Popular National Union (ZLN).