Robert Jowitt Whitwell B.Litt. (31 August 1859 – 15 May 1928) was a British medievalist who made significant contributions to lexicography.
Robert Jowitt Whitwell was born in August 1859 to Mary Ann Jowitt and Edward Whitwell. The Whitwell family were based in Kendal, where Edward's brother John was the local MP from 1868 to 1880. In April 1884, Robert married Louisa Crommelin Brown, a Glaswegian, with whom he had two daughters and one son. By 1898, they had moved to Oxford, where they lived at 70 Banbury Road, a few doors away from the editor of the OED. In 1914 their younger daughter, Louisa Crommelin Roberta Jowitt Whitwell, married Hastings Russell, the then Marquess of Tavistock, who had studied history at Oxford. Robert died in May 1928, and his wife Louisa died in January 1945.
In his twenties, while he was still living in Kendal, Whitwell became a prolific voluntary contributor to the OED, submitting some 17,000 quotation slips between 1879 and 1884; by the time the first volume was published in 1888, his slip total was the 7th highest at 33,000. His academic life was, however, based at Oxford University, where he received a B.Litt. from Corpus Christi before becoming associated with New College. In 1901, he was Honorary Secretary of the Oxford Architectural and Historical Society, and in 1907 he was listed as a tutor in Modern History with colleagues including H. W. C. Davis, G. Baskerville, F. Madan, R. L. Poole, R. Rait, and A. L. Smith.