Udumalai, also known as Udumalaipettai and Udumalpet, is a town in Tiruppur district in the Indian state of Tamil Nadu. It is located 535 km south west from the state capital, Chennai and 72 km from Coimbatore. It is the headquarters of Udumalaipettai taluk and had a population of 61,133 as per 2011 Census of India. The town comes under the Udumalaipettai Assembly constituency.

Tiruppur District is one of the 38 districts of the Indian state of Tamil Nadu, formed in 22 February 2009. Dharapuram was the largest taluk by area in the district. The district is well-developed and industrialized. The Tiruppur banian industry, the cotton market, Kangeyam bull and Uthukkuli butter, among other things, provide for a vibrant economy. The city of Tiruppur is the administrative headquarters for the district. As of 2011, the district had a population of 2,479,052 with a sex-ratio of 989 females for every 1,000 males.