Hemyock is a village in Devon, England. It is located approximately five miles from the Somerset town of Wellington. The village population at the 2011 Census was 1,519. Hemyock is part of the electoral ward of Upper Culm. The population of this ward at the above census was 4,039. The River Culm flows through Hemyock. Hemyock was the former home of the St Ivel dairy processing plant, formerly where the butter-spreads 'St Ivel Gold' and 'Utterly-Butterly' were produced before being moved to a factory in the north of England.
Hemyock was also the birthplace of the National Federation of Young Farmers' Clubs. The first Young Culm Farmers Club in England began here in 1921, and it continues to prosper as the Culm Valley Young Farmers Club.
Hemyock is the largest village on the Blackdown Hills, which is now designated as an Area of Outstanding Natural Beauty (AONB). The parish has an area of about 2350 hectares, and lies on the NW of the Blackdown Hills.