| Ponnai | |
| Pushpin Map: | India Tamil Nadu |
| Pushpin Map Caption: | Location in Tamil Nadu, India |
| Coordinates: | 13.1333°N 79.2667°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Tamil Nadu |
| Subdivision Type2: | District |
| Subdivision Name2: | Vellore |
| Unit Pref: | Metric |
| Elevation M: | 243 |
| Population Total: | 15850 |
| 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: | 632514 |
| Registration Plate: | TN - 23 |
| Blank1 Name Sec1: | Nearest city |
| Blank1 Info Sec1: | Vellore |
| Blank2 Name Sec1: | Lok Sabha constituency |
| Blank2 Info Sec1: | Arakkonam |
| Blank3 Name Sec1: | Civic agency |
| Website: | ponnai.com |
Ponnai is a Town panchayat which is located in the Vellore District within the state of Tamil Nadu.[1] Ponnai Panchayat is composed of 18 villages, with Ponnai serving as the head town.
Nearby towns are linked by rail and air.[2] Frequent buses are available to Vellore, Tiruttani, Arcot,Chittoor and Sholinghur. Buses to Chennai, Bangalore, Tirupathi, Kanchipuram, Tambaram, and Chengalpattu run less frequently.
The nearest railway stations are Chittoor in Andhra Pradesh, and Vellore Katpadi Junction in Tamil Nadu.
The nearest port is in Chennai, and the nearest airports are Tirupathi in Andhra Pradesh, Chennai in Tamil Nadu, and Vellore Airport.
The Katpadi assembly constituency is part of the Arakkonam (Lok Sabha constituency).[3]