Sir Ernest Barker (September 23, 1874 – February 17, 1960) was a British political scientist. He became in 1928 Professor of Political Science at the University of Cambridge, being the first holder of the chair endowed by the Rockefeller Foundation. He received a knighthood in 1944.
From a working-class background in Woodley, Cheshire, he won a scholarship to the University of Oxford. He was a don at Oxford, and spent a brief time at the London School of Economics. He was Principal of King's College London from 1920 to 1927.
He married Olivia Stuart Horner in 1927.
- Political Thought in England from Herbert Spencer to To-day: 1848-1914 (1915)
- Greek Political Theory: Plato and his Predecessors (1918)
- Ireland in the last Fifty Years, 1866-1918 (1919)
- Britain and the British People (1942)
- Reflections on Government (1942)
- Principles of Social and Political Theory (1951)
- Essays on Government (1951)
- Social Contract: Essays by Locke, Hume, and Rousseau
- The European Inheritance
- The Politics of Aristotle
- Age and Youth: Memories of Three Universities and the Father of Man
- Character of England
- Julia Stapleton (1994), Englishness and the Study of Politics: The Social and Political Thought of Ernest Barker