Count Andrzej Jerzy Mniszech (1823–1905) was a Polish nobleman, landowner, painter and art collector.

His was born as the younger son of Count Karol Filip Wandalin Mniszech (1794–1844), and his wife, Countess Eleonora Cetner (1798–1871).

His paternal grandfather was Count Michał Jerzy Mniszech, a Polish nobleman who was Grand Marshal of the Crown during the reign of Stanisław II Augustus.

In 1846 he inherited a lot of debt, and when he moved with his wife, Countess Anna Elżbieta Potocka (1827–1885) and their son Leon (1849–1901) to Paris in 1854, he took with him a large part of the private family collection from Wiśniowiec, especially paintings.

The palace the couple acquired in 1861 at 16 Rue Daru in Paris was owned by his wife, and after her death in 1885, it passed to their son Leon.