Reginald Jeeves is a fictional character in a series of humorous short stories and novels by P. G. Wodehouse (1881–1975), being the highly competent valet of a wealthy and idle young Londoner named Bertie Wooster. Created in 1915, Jeeves continued to appear in Wodehouse's work until his last completed novel Aunts Aren't Gentlemen in 1974, a span of 59 years. The name "Jeeves" comes from Percy Jeeves (1888–1916), a Warwickshire cricketer killed in the First World War.

Both the name "Jeeves" and the character of Jeeves have come to be thought of as the quintessential name and nature of a valet or butler, inspiring many similar characters (as well as the name of the Internet search engine Ask Jeeves). A "Jeeves" is now a generic term as validated by its entry in the Oxford English Dictionary.

In a conversation with a policeman in "Jeeves and the Kid Clementina", Jeeves refers to himself as both a "gentleman's personal gentleman" and a "personal gentleman's gentleman." This means that Jeeves is a valet, not a butler; that is, he serves a man and not a household. However, Bertie Wooster has lent out Jeeves as a butler on several occasions, noting that "if the call comes, he can buttle with the best of them."

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