Greengard is a surname. Notable people with the surname include:
Irene Greengard (1924–2013), American actress and writer under the name Chris Chase Leslie Greengard (born 1957), American mathematician Michael "Mig" Greengard (born 1969), American chess author and journalist Paul Greengard (1925–2019), American molecular neuroscientist, shared the 2000 Nobel Prize for Physiology or Medicine
See also Pearl Meister Greengard Prize