Sidbury is a large village north of Sidmouth on the A375 road in Devon, England. In 2011 the built-up area had a population of 457. In 1951 the civil parish had a population of 2507.
It is situated on the River Sid, which rises at Crowpits Covert (OSGB36 grid reference SY138963) and runs for 6 miles (10 km) to Lyme Bay at Sidmouth. Above the village is Sidbury Castle, the site of an Iron Age hill fort.