Jacek Małachowski (; 25 August 1737 – 27 March 1821) was a Polish nobleman, politician and administrator as well as Polish chancellor. He was the son of Jan Małachowski, also a Polish chancellor. One of his four brothers was Count Stanisław Małachowski, who was a prime force behind the Constitution of 1791.
He was Crown Deputy Master of the Pantry since 1764. Referendary of the Crown in 1764–1780, Deputy Chancellor the Crown since 1780 and Grand Chancellor of the Crown since 1786.
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