Clement Blair Peach (25 March 1946 – 24 April 1979) was a New Zealand teacher who was killed during an anti-racism demonstration in Southall, London, England. A campaigner and activist against the far right, in April 1979 Peach took part in an Anti-Nazi League demonstration in Southall against a National Front election meeting in the town hall and was hit on the head, probably by a member of the Special Patrol Group (SPG), a specialist unit within the Metropolitan Police Service. He died in hospital that night.
An investigation by Commander John Cass of the Metropolitan Police's Complaints Investigation Bureau concluded that Peach had been killed by one of six SPG officers, and others had preserved their silence to obstruct his investigation.