Udangudi (Tamil: உடன்குடி) is a Panchayat town in Thoothukudi district in the Indian state of Tamil Nadu. Udangudi is a Taluk in Tuticorin District . Years back Udangudi and its suburbs had a lot of Palmyrah groves, where the main occupation was to extract Palm Juice and prepare Karuppukatti or KarpagaKatti (Palm Jaggery, presumably karuppukatti is a transformed form for "Karumbukatti- sugar(cane)piece). More than a century back this centre was the place which catered to the Palm Jaggery requirements to the demands of South India and also Palm Jaggery requirements to several other countries where it was exported.
There are many churches for Protestant and Catholic in the small town. Many Churches have a history of 150 years. St.Mark's (Christianagaram). One more famous church is Yesuvin Thirunama Aaalayam, Santhaiadiyoor.