Jan Wiktor Tomasz Zawidzki (December 20, 1866 in Włóki, Masovian Voivodeship – September 14, 1928 in Warsaw) was a Polish physical chemist and historian of chemistry. He researched mainly chemical kinetics, thermochemistry and autocatalysis.

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Zawidzki was a professor of the Akademia Rolnicza in Dublany (1907–1916), Jagiellonian University (1916–1917), University of Warsaw (1917–1928), rector of the University of Warsaw (1918–1919), member of the Academy of Learning (since 1918), co-founder of the Polish Chemical Society and magazine Roczniki Chemii.

• Kinetyka chemiczna (1931)
• Chemia nieorganiczna vol. 1–2 (1932–1936)

• "Zawidzki Jan Wiktor Tomasz". Internetowa encyklopedia PWN (in Polish). Wydawnictwo Naukowe PWN. Retrieved 2007-12-05.
• "Zawidzki Jan Wiktor". WIEM Encyklopedia (in Polish). Retrieved 2007-12-05.

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