Sir William Sinclair Marris, KCSI, KCIE (9 October 1873 – 12 December 1945[2]) was a British civil servant, colonial administrator, and classical scholar.

He was a member of the Indian Civil Service during the British Raj, and later became Vice-Chancellor of the University of Durham.

Born on 9 October 1873, Marris was educated at Wanganui Collegiate School and Canterbury College in New Zealand, and later studied at Christ Church, Oxford.

After retirement from the Indian Civil Service, Marris returned to Northern England and remarried to Elizabeth Wilford in 1934, whom he had known from his childhood in New Zealand.

In 1921, he laid Murari Chand College's foundation stone in Thackeray Hills, Sylhet alongside Syed Abdul Majid.