Kalbfleisch is a German surname. Notable people with the surname include:
George Randolph Kalbfleisch (1931–2006), US physicist Girard Edward Kalbfleisch (1899–1990), US judge James G. Kalbfleisch (1940–2017), Canadian academic Martin Kalbfleisch (1804–1873), Dutch-American politician Walter Kalbfleisch (1911–1960), Canadian hockey player
See also F. W. Kalbfleisch, former Germany publishing company