Haddon Hill is a prominent east–west aligned ridge in west Somerset, England, close to Hartford within the civil parish of Brompton Regis.

It lies on the south-eastern fringe of Exmoor National Park though is separated from the Exmoor massif itself by the valleys of the rivers Haddeo and Exe The highest point of the ridge at OS grid reference SS 962286 is crowned by a trig point at 1,164 feet (355 m) above sea level.

A couple of public footpaths traverse the hill north–south whilst numerous tracks run along its length.

[2] A tree ring, surrounded by a bank and ditch, on the hill was previously thought to be a Bronze Age tumulus although this is no longer the case.

[5] During World War II a military camp was built on the hill with several buildings to accommodate soldiers from the United States Army during the buildup to the Normandy landings in 1944.