Sedlmayr is a surname. Notable people with the surname are:
Carl J. Sedlmayr (1886–1965), American founder and owner of Royal American Shows Hans Sedlmayr (1896–1984), Austrian art historian Helene Sedlmayr (1813–1898) German beauty Walter Sedlmayr (1926–1990) German actor from Bavaria Max Sedlmeyer, German mountaineer and climber