Hemyock is a village and civil parish in Devon, England. It is about 8 miles north-west of Honiton and 5 miles (8 km) south of the Somerset town of Wellington. The 2011 Census recorded the parish's population as 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. Its northern boundary forms part of the Devon – Somerset border, and clockwise from there, it is surrounded by the Devon parishes of Clayhidon, Dunkeswell, Uffculme and .
Hemyock is a typical upland settlement consisting of a central "town" surrounded by a number of hamlets (Culm Davey, Millhayes, Simonsburrow, Ashculme, Tedburrow, Madford, Mountshayne etc.). From the 16th century to the early 19th century much of the parish's wealth came from the production of wool. The population remained fairly constant throughout the 19th century, and until the end of the Second World War. Since then a number of housing estates have been built, and the population has increased to 1,519.