Jonasz Szlichtyng (German: Jonas Schlichting) (Bukowiec, Lubusz Voivodeship 1592 - Sulechów 1661) was a Polish nobleman, theologian of the Socinian Polish Brethren and father of Krzysztof Szlichtyng.
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He studied in Germany, from where he returned to teach in Raków, Kielce County at the Racovian Academy, and then in Lusławice, Lesser Poland Voivodeship.