Mór Lipót Herzog (1869-1934) was a Jewish Hungarian art collector, banker, and large estate owner whose art collection is the object of Holocaust-related restitution claims.

He participated in the Sonderbund westdeutscher Kunstfreunde und Künstler.

[2][3][4][5] The collection was estimated to contain more than 2,000 artworks, including The Rue Mosnier Dressed with Flags and La Négresse by Manet as well as Francisco de Zurbarán’s portrait of Saint Andrew, The Annunciation to Joachim by Lucas Cranach the Elder( 1518) and The Annunciation to Joachim by Lucas Cranach the Elder (1518)[6] Martha Nierenberg, his granddaughter, tried for many years to recover art looted from the Herzog family.

[7][8][9][10] In 2010, his heirs sued the Hungarian government for the return of more than 40 paintings seized during World War II, valued in excess of US$ 100 million.

[11][12][13] The case reached the United States Supreme court as De Csepel et al. v. Republic of Hungary et al.[14][15]