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Corn Hill, also called Carn Hill or Carn Clonhugh (Irish: Carn Clainne Aodha or Sliabh Cairbre), is a hill in County Longford, Republic of Ireland. It lies north of Longford, between Drumlish and Ballinalee, in the parish of Killoe. At 278 metres above sea level, it is the highest hill in the county and has a television mast (Cairn Hill transmission site) on the top which rises 123 metres above the peak of the hill.

The Cairn Hill transmission site is located on a 278-metre hill (Carn Clonhugh) in County Longford that lies 10 km north east of Longford town.This was the first UHF television transmitter to be opened in the Republic of Ireland by RTÉ to facilitate the introduction of their second television channel (RTÉ 2) in 1978, two new channels TV3 and TG4 were also added later.