Jacob Epstein (1771 – 16 August 1843) was a Polish banker and philanthropist of Jewish descent. In early manhood he went to Warsaw, where he succeeded in amassing a large fortune and became one of the most prominent figures in the old Polish capital. He was the first Jew in Warsaw to discard the old-style Jewish garb and to dress himself and his family in European fashion. In the November Uprising of 1830–31 Epstein took the part of his oppressed countrymen, and was an officer in the insurrectionary army; but later he seems to have completely regained the favor of the Russian government, as is evidenced by his appointment as banker of the treasury commission of the Kingdom of Poland in 1838.