Madeline Bassett is a fictional character in the Jeeves stories by English comic writer P. G. Wodehouse, being an excessively sentimental and fanciful young woman to whom Bertie Wooster intermittently, and reluctantly, finds himself engaged.

The daughter of Sir Watkyn Bassett and the cousin of Stephanie "Stiffy" Byng, Madeline has golden hair, a treacly voice, a tinkling, silvery laugh and when she sighs, it sounds "like the wind going out of a rubber duck".

[3][4] He also notes that she is excessively mushy and fanciful, regularly espousing whimsical beliefs about gnomes and stars.

Bertie is surprised to learn this in Stiff Upper Lip, Jeeves, when he asks her hypothetically what would happen if Gussie Fink-Nottle ate steak and kidney pie (against her wish for him to be vegetarian).

Her engagement to Gussie holds during The Mating Season, in which she visits an old friend of hers, Hilda Gudgeon, with whom she was educated at Roedean.