Jan Gniński (died c.1685) was a Polish-Lithuanian diplomat, Treasurer of the Crown Court. He was Vice-Chancellor of the Crown from 1681, voivode of Malbork in 1681, governor from 1668 to 1680 of Chelm and was an MP in the Sejm. He participated in the Polish-Swedish wars and the Siege of Vienna (1683) and was known to be an Ambassador to Turkey.
- Poland. Rada Głowna Szkolnictwa Wyższego. Komisja do Spraw Bibliotek i Informacji Naukowej; Poland. Ministerstwo Nauki, Szkolnictwa Wyższego i Techniki (1986). Roczniki biblioteczne. Państwowe Wydawn. Naukowe. Retrieved 4 November 2011.
- Zamoyski, Adam (1 October 2009). Poland: A History. HarperCollins Publishers. p. 209. ISBN 978-0-00-732273-2. Retrieved 4 November 2011.