Ayyampettai is a panchayat town in Thanjavur district in the state of Tamil Nadu, India. It is located 15 km from Thanjavur and 24 km from Kumbakonam.
| Country |  India |
|---|---|
| State | Tamil Nadu |
| District | Thanjavur |
| Taluk | Papanasam |
| Area | |
| • Total | 7.73 km2 (2.98 sq mi) |
| Elevation | 28 m (92 ft) |
| Population (2011) | |
| • Total | 16,263 |
| • Density | 2,100/km2 (5,400/sq mi) |
| Languages | |
| • Official | Tamil |
| Time zone | UTC+5:30 (IST) |
| PIN | 614201 |
| Telephone code | 04374 |
| Vehicle registration | TN 49 TN 68 |