Idaiyangudi is a panchayat town in Tirunelveli district in the Indian state of Tamil Nadu. It lies between Uvari and thisayanvilai. The nearest railway station is Nanguneri and the nearest airport is in Thoothukudi. It is well connected to Thirunelveli, 40 miles northwest. This village was the recepiant of the Uthamar Gandhi award.
Bishop Robert Caldwell, the father of Dravidian languages, spent most of his lifetime here as a missionary, so the village is predominantly Christian. The Idaiyangudi Holy Trinity church is gothic landmark in the village centre. Most of the land surrounding the village is owned by the church.
There one school in Idaiyangudi – Caldwell Memorial School. A new nursing college is also being started there by the Church.