Kalmar or Kalmár is a surname. Notable people with the surname include:
Bert Kalmar (1884–1947), American songwriter Carlos Kalmar (born 1958), Uruguayan conductor Ferenc Kalmár (born 1955), Hungarian physicist and politician Henrik Kalmár (1870–1931), Hungarian dissident Ivan Kalmar (born 1948), Canadian professor János Kalmár (born 1942), Hungarian fencer Jenő Kalmár (1908–1990), Hungarian footballer and coach László Kalmár (1905–1976), Hungarian mathematician László Kalmár (1900–1980), Hungarian film director Nick Kalmar (born 1987), Australian footballer Pál Kalmár (1900–1988), Hungarian pop singer Stefan Kalmár, German curator Zsolt Kalmár (born 1995), Hungarian footballer