Blackmer is a surname. Notable people with the surname include:
David E. Blackmer (1927–2002), audio engineer Sidney Blackmer (1895–1973), American actor Fulton-Mock-Blackmer House, also called Blackmer House Suzanne Blackmer (1912–2004), American actress Eunice Murray Blackmer (1902–1994), American housekeeper, nurse and writer
See also Blackmer v. United States