Blight is an English surname. Notable people with this surname include the following:
David W. Blight (born 1949), American historian
Digby Blight (born 1931), Former Director of Premier and Cabinet, Western Australia
James Blight (born 1976), Canadian voice-actor
John Blight (1913–1995), Australian poet of Cornish ancestry
John Thomas Blight (1835–1911), Cornish archaeological artist
Malcolm Blight (born 1950), former Australian rules footballer
Rick Blight (1955–2005), Canadian hockey player
Vicki Blight (born 1981), UK radio DJ