| Udangudi | |
| Settlement Type: | Panchayat town |
| Pushpin Map: | India Tamil Nadu#India3 |
| Pushpin Map Caption: | Location in Tamil Nadu, India |
| Coordinates: | 8.4333°N 78.0167°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Tamil Nadu |
| Subdivision Type2: | District |
| Subdivision Name2: | Thoothukudi |
| Unit Pref: | Metric |
| Area Total Km2: | 11.23 |
| Population Total: | 19,738 |
| Population As Of: | 2011 |
| Population Density Km2: | auto |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Official |
| Demographics1 Info1: | Tamil |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Postal Code Type: | PIN |
| Postal Code: | 628203 |
| Area Code Type: | Telephone code |
| Area Code: | 04639 |
| Registration Plate: | TN 69, TN 92 |
Udangudi is a Panchayat town in Thoothukudi district in the Indian state of Tamil Nadu.
India census,[1] Udangudi had a population of 19,738. Males constitute 49.92% of the population and females 50.07%. Udangudi has an average literacy rate of 93.18%, very much higher than the state average of 80.09%: male literacy is 95.08%, and female literacy is 91.30%.[1]
Udangudi in British rule had railway line connected to Tiruchendur. This railway line was laid primarily to take advantage of collecting the Palm Juice extraction going around Udangudi and British established a Jaggery Factory near Kulasekaran pattinam for export market. Unfortunately, the factory became non-operational which resulted in non-usage of this railway line.
The town is an example of peaceful co-existence with population of Muslims, Christians and Hindus distributed in equal proportions and the entire people live in harmony.
T.D.T.A.Higher Secondary School is the oldest school for boys, Mary Ann Best Higher Secondary School for girls from which most people got educated and One more School Sri. Ramakrishna Chidhambareshwarer. Hr.Sec.School (Sri.R.K.C) is also there and there is most famous schools are there like St. Antony's RC Middle School, Saiva Prakasa Vidyasalai School, Anitha Kumaran Matric. Higher Secondary School. Najath School and Salma School etc.
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.
The name Udangudi might have been derived from two Tamil words. "Udai" means the thorny tree (Acacia planifrons) which is abundant in that area. "Kudi" refers to a village or a human settlement. The two words when joined together its pronounced as "Udangudi".
Some people told this is the village having equal number of Hindu, Christian and Muslims. They lived here with a close relationship. So it named as 'Udangudi'.
2x660 MW, Stage-I LOA issued to M/s BHEL for Design, Engineering, Manufacture, Supply, erection, testing and commissioning of complete 2x660MW coal based Supercritical thermal power project, Udangudi Stage I, on Engineering, Procurement and Construction basis for a value of Rs.7359 crores on 7.12.17.