Blackham is an English surname. Notable people with the surname include:
Blackham baronets
Denis Blackham (born 1952), British audio engineer
Dorothy Blackham (1896–1975), Irish illustrator, artist, and teacher
Ernest Blackham (1898–1966), English footballer
Fred Blackham (1873–1967), Australian rules footballer
H. J. Blackham (1903–2009), British humanist philosopher, writer and educationalist
Jack Blackham (1854–1932), Australian cricketer
Jeremy Blackham (born 1943), British Royal Navy officer
Joan Blackham, British actress
