Raja Tridiv Roy (Urdu: راجہ تری دیو راۓ), sometimes spelled Tridev Roy, (14 May 1933 – 17 September 2012) was the former 50th Raja of the Chakma tribe in the Chittagong Hill Tracts region of present-day Bangladesh from 2 May 1953, until his abdication in 1971 following the Bangladesh Liberation War. He chose to remain a Pakistani when Bangladesh achieved independence in 1971. He became known as a writer, diplomat, Buddhist religious leader and politician in Pakistan. Between 1981 and 1995, he served as Ambassador of Pakistan to Argentina with concurrent accreditation in Chile, Uruguay, Peru and Ecuador. He was also a Minister-For-Life within the Pakistani government. Tridev Roy died in September 2012.
Roy was born in 1933 in Rajbari, Rangamati, Chittagong Hill Tracts, British India. He was the son of Raja Nalinaksha Roy.
He was installed as the 50th Raja, or hereditary King of the Chakma Circle, on 2 May 1953. Roy abdicated the throne 1971 in favour of his son, Raja Devasish Roy, the current ruler of the Chakma people, during the Bangladesh Liberation War. Roy remained a practicing Buddhist, the predominant faith of the Chakma people, throughout his life.