| Tandarai | |
| Settlement Type: | panchayat town |
| Pushpin Map: | India Tamil Nadu#India3 |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Tamil Nadu, India |
| Coordinates: | 12.1°N 79.2°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Tamil Nadu |
| Subdivision Type2: | District |
| Subdivision Name2: | Tiruvanamalai |
| Unit Pref: | Metric |
| Elevation M: | 81 |
| Population Total: | 5201 |
| Population As Of: | 2001 |
| Population Density Km2: | auto |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Official |
| Demographics1 Info1: | Tamil |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
Tandarai is a Panchayat town in Tiruvanamalai district, Tamil Nadu India. It is the fourth largest town in Kilpennathur taluk and has one railway station. It lies between Vettavalam and Veraiyur and has a population of 5201 and altitude of 81m.