Robert Dennis Hilton Smith (1903–1974), often referred to as R. D. Hilton Smith, was an English-born librarian who emigrated to Canada where he worked as a librarian and then as a bookseller.

In 1937 he was the Borough Librarian in the Metropolitan Borough of Deptford, in south-east London, England, the editor of The Library Association Record and a Fellow of The Library Association (F.L.A.).

He was the deputy chief of the Toronto Public Library until the 1950s when he left to move to Victoria, British Columbia and establish The Adelphi Book Shop Ltd. which was still operating in the period 1962-73.

He wrote: "Canada’s best and brightest end up retired in Victoria and bring with them fine libraries and collections - in fact in many cases they’ve written their own books. For the book lover there’s a 100 years of treasures waiting to be found. (1961)"

R. D. Hilton Smith was once described as an antiquarian bookseller, a former Deputy Chief Librarian in the Toronto Public Libraries, and a consultant editor for the Encyclopedia Canadiana.