Professor Thambiah Nadaraja (December 27, 1917 - January 20, 2004) was a Sri Lankan academic, lawyer and author.

[2][5] Whilst in the UK Nadaraja joined Lincoln's Inn from where he was awarded the First Class Certificate of Honour by the Council of Legal Education.

[3] Nadaraja returned to Ceylon and joined the local bar as an advocate, working in the chambers of S. J. V.

[3][5] In the 1950s Nadaraja was a member of a three-man Royal Commission on the death penalty headed by Professor Needham.

[3] The commission's recommendations eventually led to the de facto abolition of the death penalty in Sri Lanka.

[3] Nadaraja was president of the Sri Lanka branch of the Royal Asiatic Society and Classical Association.

[2][5] The Bar Council of Sri Lanka honoured Nadaraja's achievements by awarding him Life Membership Honoris Causa.