Peter John Roussel Luff FRSA FRGS (born 14 September 1946), is a British campaigner and activist. He has been active in a number of non-governmental organisations with varying goals. He was a Director of the Royal Commonwealth Society from 1997 to 2001, Director and Vice Chair of The European Movement UK, The International European Movement from 1986 to 1995, and Assistant Director of Amnesty International UK (1974–1978).