Sendamangalam is a town, municipality, and taluk in Namakkal District, Tamil Nadu, India.

Namakkal District is one of the 38 districts in the state of Tamil Nadu, India. The district was bifurcated from Salem District with Namakkal town as headquarters on 25 July 1996 and started to function independently from 1 January 1997. The district has eight taluks (subdivisions): Tiruchengode, Namakkal, Rasipuram, Paramathi Velur, Sendamangalam, Kumarapalayam, Kolli Hills and Mohanur. It has two revenue divisions: Tiruchengode and Namakkal. As of 2011 census, Namakkal district had a population of 1,726,601 with a sex-ratio of 986 females for every 1,000 males and Tiruchengode is the largest city in terms of population. Namakkal district is geographically affiliated to Kongu Nadu region. The district is famous for its large poultry industry, egg production and lorry bodybuilding industry, for which it is often referred to as "Egg City" and "Transport Hub of South India".