Michał Grabowski Poniatowski of the Oksza coat of arms (1773 – 17 August 1812) was a brigadier general of the Army of Duchy of Warsaw.
He was the natural son of the King of Poland and Grand Duke of Lithuania, Stanisław August Poniatowski and Elizabeth Grabowska, from the house Szydłowska and brother of Stanislaw Grabowski.
He stayed under the care of King Stanisław August Poniatowski who was on the alert during his army career.
He participated in the campaign of 1807, commanding the 1st Infantry Regiment in Poniatowski's Division.
In 1812, during the expedition of Napoleon to Russia, he commanded the 1st Brigade of Kniaziewicz's 18th Division in the V Corps.