Józef Sylwester Sosnowski

Józef Sylwester Sosnowski, of the Nałęcz coat-of-arms, was a Polish-Lithuanian magnate — Voivode of Smolensk and Połock, Grand Notary of Lithuania (1754), Field Notary of Lithuania (1764–71), Field Hetman of Lithuania (1775–80), a delegate to the Convocation Sejm of 1764, and Marshall of the Electoral Sejm of 1764.