Peter Alan Martin Clemoes (20 January 1920 – 16 March 1996) was a British historian.

Born in Southend-on-Sea and educated at Brentwood School, he originally wished to become an actor and won a scholarship to RADA but the Second World War intervened and he served with the Royal Corps of Signals. After the war he took a degree in English from Queen Mary College, London, which was followed by postgraduate work on Anglo-Saxon at King's College, Cambridge, gaining a PhD in 1956. He then held a research fellowship at the University of Reading until 1961 when he returned to Cambridge under Dorothy Whitelock, whom he replaced as Elrington and Bosworth Professor of Anglo-Saxon in the Department of Anglo-Saxon, Norse and Celtic in 1969.

His son Martin is the founder of Eye2eye Software Ltd, based in Cambridge, England.

Anglo-Saxon England

Clemoes was the editor of the journal Anglo-Saxon England, an annual survey of the literature on the subject, which also included a number of substantial papers. The journal is a key publication in the field and is still published annually as of 2023.