Mollenhauer is a surname. Notable people with the surname include:
Edward Mollenhauer (1827–1914), American violinist and composer Emil Mollenhauer (1855–1927), American musician, orchestra violinist and conductor Henry Mollenhauer (born 1876), American tennis player Klaus Mollenhauer (1928–1998), German pedagogical theorist Paula Mollenhauer (1908–1988, German athlete and Olympian