Suryadeo Singh (27 December 1939 – 15 June 1991) was an Indian mafia leader and politician from Jharkhand.

He ran a protection racket in Dhanbad and was a major financier for the Janata Party.

In 1977, he won assembly elections on JP's ticket and became a close associate to future Prime Minister Chandra Shekhar.

He was the founder and chairman of Janta Majdoor Sangh, a trade union in Jharkhand.

He died on 15 June 1991 in Dhanbad, Jharkhand during his visit to Ranchi High Court.