Somerville was born at Ballincollig in County Cork in Ireland and was educated at Queen's College, Cork, and at Trinity College, Cambridge, where he was a Mathematical Scholar. He then became a schoolmaster, first at Wellington College and then at Eton College. He was elected as Member of Parliament (MP) for Windsor at the 1922 general election, and served until he died in office in 1942.
- Craig, F. W. S. (1983) . British parliamentary election results 1918-1949 (3rd ed.). Chichester: Parliamentary Research Services. ISBN 0-900178-06-X.
- Leigh Rayment's Historical List of MPs
- Hansard 1803–2005: contributions in Parliament by Annesley Somerville
- "Somerville, Annesley Ashworth (SMRL876AA)". A Cambridge Alumni Database. University of Cambridge.
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| Member of Parliament for Windsor