Virudhunagar District is a district (an administrative district) of Tamil Nadu state in south India. Virudhunagar is the district headquarters of Virudhunagar district. Virudhunagar district was formed by the separation of Old Ramanathapuram District in 1987 into Ramanathapuram District, Sivagangai District and the west part as Virudhunagar District. Virudhunagar District was formerly called Karmavirer Kamarajar District. As of 2011, Virudhunagar district had a population of 1,942,288 with a sex-ratio of 1,007 females for every 1,000 males. Sivakasi is the most populous and largest city in the district.
