Raymond "Ray" Challinor (1929 – 31 January 2011) was a distinguished Marxist historian of the British labour movement, particularly in the North East of England. Initially a member of the Independent Labour Party, he was an early member of the Revolutionary Communist Party and then the Socialist Review group and was also a member of the group which succeeded it, the International Socialists. For a period in the 1960s he was a councillor in Newcastle-under-Lyme on the Labour Party ticket in which party IS was then resident, later writing an article in International Socialism on how the experience was politically dispiriting.
Born in Stoke-on-Trent, Challinor was educated at Keele and Lancaster Universities and became principal lecturer in History at Newcastle Polytechnic. While a member of the Socialist Workers Party, he wrote his best known work, a classic history of the Socialist Labour Party, The Origins of British Bolshevism (1977). He served as Chairman of the Society for the Study of Labour History and President of the North East Labour History Society.