Si. Balasubramania Adithan (also known as Si. Ba. Adithan) (27 September 1905 – 24 May 1981), popularly called as Adithanar, was a Tamil lawyer, politician, minister and founder of the Tamil daily newspaper Dina Thanthi. He was the founder of the We Tamils (Tamil: நாம் தமிழர்) party and served as the member of the Madras Legislative Council for two terms and as the member of the Tamil Nadu Legislative Assembly for four terms.