Thirumavalavan or Thol. Thirumavalavan (Tamil: தொல்.திருமாவளவன், born 17 August 1962), is a Dalit activist, Member of Parliament in 15th Lok Sabha and the current President of the Viduthalai Chiruthaigal Katchi (Liberation Panthers Party), a Dalit political party in the state of Tamil Nadu in India. He rose to prominence in the 1990s as a Dalit leader, and entered politics in 1999. His political platform centres around ending the caste-based oppression of the Dalits, which he argues can best be achieved through reviving and reorienting Tamil nationalism. He has also expressed support for Tamil nationalist movements and groups elsewhere, including Sri Lanka.

Thirumavalavan was the second child of Tholkappian (Ramasamy) and Periyammal, and was born in the village of Anganur in Ariyalur District in Tamil Nadu, India. His father had studied up to the eighth grade, while his mother remained uneducated. He has a sister and three brothers, but he was the only member of his family who went on to higher education after completion of his schooling. He initially studied chemistry, and went on to do a masters degree in Criminology, before studying law at Madras Law College. He then began working in the government's Forensic Department as a scientific assistant.