Grzegorz Knapski (Knapiusz, Cnapius; 1561–1639) was a Polish Jesuit, teacher, philologist, lexicographer and writer.

His most important work is the Thesaurus Polono-Latino-Graecus.

First published in 1621 in Kraków, second edition in 1643 also in Kraków, it became a standard reference work in Polish schools and universities until the 18th century.

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