Prince Michał Józef Masalski (Lithuanian: Mykolas Juozapas Masalskis) (c. 1700–1768)[1] was a Polish-Lithuanian nobleman (szlachcic).

He was Grand Writer of Lithuania and starost of Grodno from 1726,[2] voivode of Mscislaw Voivodeship from 1737,[3] castellan of Trakai from 1742,[4] castellan of Vilnius and Field Hetman of Lithuania from 1744,[5] and Great Lithuanian Hetman from 1762.

[6] He was Marshal of the Convocation Sejm from 27 April to 23 May 1733 in Warsaw.

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