(1771-1812) was a Polish painter.
Wojniakowski was a pupil of Marcello Bacciarelli.
His work as a portraitist was influenced by that of the Polish painter Jezef Grassi, as in Wojniakowski's 1796 Portrait of Izabela Czartoryska, nee Fleming.
Other note-worthy portraits by Wojniakowski include his portrait of Tadeusz Kościuszko.
Wojniakowski also produced religious works and scenes of contemporary historic events (e.g., The Constitution of May 3, 1791, 1806).
Notable as well are Wojniakowski's drawings from journeys, e.g. in Lublin Province.