| Ammapettai | |
| Native Name Lang: | ta |
| Settlement Type: | Town panchayat |
| Pushpin Map: | India Tamil Nadu |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Tamil Nadu, India |
| Coordinates: | 10.7956°N 79.3206°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Tamil Nadu |
| Subdivision Type2: | District |
| Subdivision Name2: | Thanjavur |
| Unit Pref: | Metric |
| Elevation M: | 1 |
| Population Total: | 13816 |
| Population As Of: | 2001 |
| 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: | 614401 |
| Area Code Type: | Telephone code |
| Area Code: | 04374 |
| Registration Plate: | TN49 / TN68 |
Ammapettai is a panchayat town in Thanjavur district in the state of Tamil Nadu, India.
India census,[1] Ammapettai had a population of 13,816. Males constitute 49% of the population and females 51%. Ammapettai has an average literacy rate of 73%, higher than the national average of 59.5%; with 54% of the males and 46% of females literate. 10% of the population is under 6 years of age.
This village has three public schools, Gov. high School, Appavuthevar Higher Secondary School Regina Celi Girls Higher Secondary School, Saint Marcinas matriculation school and Laxmi Vidhyalaya school. There are two other private schools.
Railway Station : Ammapettai (approx 2.5 km From Bus Stand)