Tehsil also tahsil is an administrative divisions of India denoting a sub-district. Tehsils are also referred to as "talukas" or "mandal" in some states. Tehsils can consist of multiple villages and a few towns. The Panchayat samitis are usually the administrative governing bodies of the tehsils.
Tehsils of India Wikipedia
States use varying names for their sub-districts. Detailed information is as follows (as of 2011):
Total: All India = 5564