Grumbach or von Grumbach is a surname. Notable people with the surname include:
Antoine Grumbach, French architect
Argula von Grumbach (1492–1554?), Bavarian noblewoman
Detlef Grumbach (born 1955), German author and journalist
Doris Grumbach (born 1918), American novelist, biographer, literary critic, and essayist
Kevin Grumbach, American physician and academic
Melvin M. Grumbach, American pediatrician and academic
Wilhelm von Grumbach (1503–1567), German adventurer