Surname
- Carl Gotthelf Gerlach (1704–1761), German organist and music director
- Carl Ludvig Gerlach (1832–1893), Danish composer and opera singer
- Carl R. Gerlach, mayor of Overland Park, Kansas
- Charles L. Gerlach (1895-1947), U.S. Representative from Pennsylvania
- Chris Gerlach (born 1964), American politician
- Christian Gerlach, professor of modern history at the University of Bern
- Elsie Gerlach, 20th century dental educator
- Ernst Ludwig von Gerlach (1795-1877), Prussian judge and politician
- Hellmut von Gerlach (1866-1935), German journalist and politician
- Jim Gerlach (born 1955), U.S. Congressman from Pennsylvania
- Joseph von Gerlach (1820-1896), German anatomist and professor
- Kurt Albert Gerlach (1886-1922), German sociologist
- Ludwig Friedrich Leopold von Gerlach (1790-1861), Prussian general
- Manfred Gerlach (born 1928), head of state of East Germany (1989-1990)
- Otto von Gerlach (1801-1849), German theologian and pastor
- Walther Gerlach (1889-1979), German physicist
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