Fonds consists of Daniells' personal and professional incoming and outgoing correspondence, diaries, speeches, radio broadcasts, manuscripts, poetry, subject files, research files, postcards and postcard collections, clippings, financial records, audio material, photographs, memorabilia and printed material. Also included are the records of Roy's parents, James and Constance Daniells. The correspondence series contains thousands of letters from prominent literary figures such as Earle Birney, Robert Finch, Desmond Pacey, Northrop Frye, Herbert Davis, E.K. Brown, A.S.P. Woodhouse, as well as writers, poets, and artists such as Paul Hiebert (Sara Binks), Carol Coates, Max Maynard, Jack Shadbolt and others. His works are represented by manuscripts of his poetry, fiction, drama, scholarly work on Milton and modernism and Canadian literature, speeches and broadcasts, autobiography, diaries, and many letters to his family. The fonds also contains notes of sympathy received by Daniells' family after his death.