Elanthoor is a village in Pathanamthitta district of the Southern State of Kerala, India. Situated halfway between Kozhencherry and Pathnamthitta, the area was part of the Kingdom of Travancore presumably since 1820. This peaceful rural belt has a significant place in the history of the freedom movement of the country and has made notable contributions to the film industry. It has been argued that the expression "Ellangalude Oor" shortened by over has become "Elanthoor". "Ellangalude Oor" would mean "aggravation of settlements" or a region of concentration of houses.

Pathanamthitta District, is one of the 14 districts in the Indian state of Kerala. The district headquarters is in the town of Pathanamthitta. There are four municipalities in Pathanamthitta: Adoor, Pandalam, Pathanamthitta and Thiruvalla.