O.Paneerselvam (Tamil: ஒ. பன்னீர்செல்வம்) is a former Chief Minister of Tamil Nadu. Prior to his entry into politics, he owned agricultural lands and a tea shop which he still owns. He was the chairman of Periakulam municipality in 1996. Then he contested the 2001 MLA election from Periakulam and become the PWD minister. He is the first Person from Southern Mass Devar Community to become the CM of Tamil Nadu.
He was sworn in as the Chief Minister of Tamil Nadu in September 2001 after the appointment of the then Chief Minister and AIADMK party Chief J. Jayalalithaa was quashed by the Supreme Court of India. In March 2002, he resigned as Chief Minister and J. Jayalalithaa was sworn in after the Supreme Court overturned her conviction and sentence and she won a by-election from Andipatti assembly constituency. During his stint as Chief Minister, he was widely criticized of heading a puppet government closely micro-managed by Jayalalitha.