Drumsurn (from ga Droim Sorn, meaning 'furnace ridge') is a small village and townland in County Londonderry, Northern Ireland. It is southeast of Limavady and northeast of Dungiven. It lies in the Roe Valley, at the foot of Donald's Hill and at the edge of the Sperrins. Drumsurn had a population of 357 people in the 2001 Census. It is situated within Causeway Coast and Glens district.