Mittler is a surname. Notable people with the surname include:
Barbara Mittler (born 1968), German sinologist Franz Mittler (1893–1970), Austrian-born American composer, musician, and humorist Leo Mittler (1893–1958), Austrian playwright, screenwriter and film director Thomas E. Mittler (1928–2012), Austrian entomologist Wolf Mittler (1918–2002), German radio host and journalist