Vaithianathan Navaratnam (25 October 1910 – 22 December 2006) was a Sri Lankan Tamil lawyer, politician and Member of Parliament.

[1] He was appointed joint secretary of the Illankai Tamil Arasu Kachchi (Federal Party) when it was founded in 1949.

[9] An ardent Tamil nationlist, Navaratnam fell out with the ITAK leadership over its decision to join Dudley Senanayake's national government and left the party in 1968.

[14][15] Navaratnam has written two books: Ceylon Faces Crisis (1956) and The Fall and Rise of the Tamil Nation (1995).

[17][18] He was posthumously conferred the title of Naattu Patralar (patriot) by the Liberation Tigers of Tamil Eelam.