|Sir Arunachalam Mahadeva
|Minister of Home Affairs of the State Council|
|Ceylon's High Commissioner to India|
|Born||5 October 1885
|Died||8 June 1969
|Alma mater||Royal College, Colombo|
Sir Arunachalam Mahadeva, KCMG (5 October 1885 - 8 June 1969) was a Sri Lankan, prominent colonial era legislator and diplomat. He was Minister of Home Affaires of the State Council and Ceylon's High Commissioner to India.
He was elected as a member of the Legislative Council of Ceylon and to the State Council. He became the Home Minister when D. S. Senanayake became Leader of the House. From 1948 to 1950 he served as Ceylon's High Commissioner to India.