Rajagiri (also Rajaghiri) is a panchayat village in the Papanasam taluk of Thanjavur district, Tamil Nadu, India.

[1] Rajagiri is one of the major villages of Papanasam taluk, Thanjavur dist., Tamil Nadu, India with population of more than 10,000 (as of 2014), but actual census in 2011 was 8,460 (45% male and 55% female).

The dam in Rajagiri with these two rivers are helping to farmers for agriculture of Papanasam, Valangaiman, and some area of Thiruvarur and Nagappattinam Taluks.

Nowadays, most probability every household in the village has at least one person in the Persian Gulf (Middle East Countries).

A government library has running in the heart of village is called Santhi-Kadu is a major market of its surrounding areas.