Wach is a Polish and German surname. Notable people with the surname include:
Aloys Wach (1892–1940), Austrian expressionist painter and graphic artist Andrzej Wach, Polish administrator, President of Polskie Koleje Państwowe S.A. (Polish State Railways) Monsignor Gilles Wach (born 1956), French Roman Catholic priest and co-founder and prior general of the traditionalist Institute of Christ the King Sovereign Priest Joachim Wach (1898–1955), German scholar of religion and sociologist Karl Wilhelm Wach (1787–1845), German painter Mariusz Wach (born 1979), Polish boxer Ryszard Wach (born 1946), Polish modern pentathlete
See also Wach (disambiguation) Wachs
References