Correspondence and manuscript notes, 1903-1949
- Typescript transcript of letters from William James to Olivier, 1903-1906; Photostat copies of letters from Olivier to William James, 1902-1906; Henry James (son of William) to Noel Olivier Richards, 1946
- Letters from Olivier to H.G. Wells, some with typescript transcripts, 1905-1942; Margery Olivier to Mrs Wells, 26 Jan 1909; Margaret Olivier to Mrs Wells (2 letters), n.d.
- Copy letter from Olivier to Edward R. Pease, Secretary of the Fabian Society, 25 Nov 1906
- Typescript transcript of letter from Olivier to Henry W. Nevinson, Jan 1926
- Typescript transcript of letters from Olivier to Mr Freeman, 1941-1942
- C.W. Greenridge to Noel Olivier Richards and Lady Olivier regarding publication of Sydney Olivier's The Dual Ethic, 1949
- Sydney Olivier, manuscript notes on 'The Origin and Early History of the Fabian Society'.