In the Jeeves and Wooster stories by P. G. Wodehouse, the Junior Ganymede is the club for "gentlemen's gentlemen", butlers, and valets, especially for those whose employers are members of the Drones Club. The name comes from Ganymede, who was the cup-bearer of Jupiter. Jeeves, Bertie Wooster's valet, is a member of the club.

One of the club's rules states that its members are required to write embarrassing information about their employers in the Junior Ganymede Club Book, and it is a much-laughed-about fact among the members that the section entitled WOOSTER B is the largest, containing eleven pages. While the rule requires that members keep the information recorded in the book strictly confidential, Jeeves uses it on occasion to help his employer, most notably to discover the nature of Roderick Spode's business in The Code of the Woosters.

In Much Obliged, Jeeves, Bingley, a former valet of Bertie's friend Ginger Winship, steals the Club Book and threatens to sell it, endangering Winship's campaign for election to the House of Commons; however, Jeeves promptly recovers it by drugging Bingley's drink.