Henley-on-Thames is a town and civil parish on the River Thames, in the South Oxfordshire district, in Oxfordshire, England, 9 miles northeast of Reading, 7 miles west of Maidenhead, 23 miles southeast of Oxford and 37 miles west of London, near the tripoint of Oxfordshire, Berkshire and Buckinghamshire. The population at the 2021 Census was 12,186.