Blackham is an English surname. Notable people with the surname include:
Blackham baronets 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 (1946–2020), British actress Joyce Blackham (1934–2018), British opera singer Robert J. Blackham (1868–1951), author, doctor and army officer Sam Blackham (1890–1956), English footballer
See also Blackham, English village Blackham Coliseum, located in Lafayette, Louisiana