Georg Detlev von Flemming (Polish: Jerzy Detloff Fleming) (3 March 1699 – 10 December 1771) was a General in Polish-Saxon service, Grand Treasurer of Lithuania in 1746–1764 and Voivode of Pomerelia in 1766.
Von Flemming was born on 3 March 1699 in Iven, a town in Swedish Pomerania, then part of the Holy Roman Empire.
His father was a Prussian privy councillor, Count Felix Friedrich von Flemming (1661–1739).
His daughter, Izabela Fleming, married another renowned politician and statesman Adam Kazimierz Czartoryski.
In 1738 he was promoted to the rank of General in the artillery and on 3 August 1744 he received the Order of the White Eagle.