Greengrass is a surname. Notable people with the surname include:
Jessie Greengrass (born 1982), British poet and author Jim Greengrass (1927–2019), American professional baseball player John Greengrass, New Zealand rugby league footballer Ken Greengrass (1926–2014), American music and television producer Paul Greengrass (born 1955), English film director, screenwriter and former journalist
Fictional characters Astoria Greengrass, character from J. K. Rowling's Harry Potter series Claude Greengrass character from the British period police drama Heartbeat
See also
Barney Greengrass, restaurant on the Upper West Side of Manhattan