Rai Bahadur Dinesh Chandra Sen (Bengali: দীনেশ চন্দ্র সেন) (3 November 1866 – 20 November 1939) was a Bengali writer, educationist, and researcher of Bengali folklore from the Indian subcontinent. He was the founding faculty member and the Ramtanu Lahiri Research Fellow of the Department of Bengali Language and Literature of the University of Calcutta. He died in Calcutta in 1939.

Sen was born to Ishwar Chandra Sen and Rupalata Devi in the village of Suapur (in present-day Dhaka District, Bangladesh). His mother's family was from Bogjuri in Manikganj District. Hiralal Sen was a cousin on that side. His grandson Samar Sen was a noted Bengali poet.

In 1882, he passed his university entrance examination from Jagannath College in Dhaka. In 1885, he passed his F.A. examination from Dhaka College. He passed his B.A. examination with honours in English literature in 1889. In 1891, he became the headmaster of the Victoria School (which was later uplifted to Victoria College) in Comilla. During 1909–13, he was a reader in the newly founded Department of Bengali Language and Literature of the University of Calcutta. In 1913, he became the Ramtanu Lahiri Research Fellow in the same department. In 1921, the University of Calcutta conferred on him the Doctorate of Literature in recognition of his work. In 1931, he received the Jagattarini gold medal for his contribution to Bengali literature. He retired from service in 1932.

He worked on the collection and compilation of Bengal folklore. Along with Chandra Kumar De, he published Mymensingh Gitika (Ballads of Mymensingh), a collection of 21 ballads.