Lady Windermere's Fan, A Play About a Good Woman is a four-act comedy by Oscar Wilde, first produced 22 February 1892 at the St James's Theatre in London. The play was first published in 1893. Like many of Wilde's comedies, it bitingly satirizes the morals of Victorian society, particularly marriage.

The story concerns Lady Windermere, who discovers that her husband may be having an affair with another woman. She confronts her husband but he instead invites the other woman, Mrs Erlynne, to his wife's birthday ball. Angered by her husband's unfaithfulness, Lady Windermere leaves her husband for another lover. After discovering what has transpired, Mrs Erlynne follows Lady Windermere and attempts to persuade her to return to her husband and in the course of this, Mrs Erlynne is discovered in a compromising position. It is then revealed Mrs Erlynne is Lady Windermere’s mother, who abandoned her family twenty years before the time the play is set. Mrs Erlynne sacrifices herself and her reputation in order to save her daughter's marriage.

The best known line of the play sums up the central theme: We are all in the gutter, but some of us are looking at the stars. —Lord Darlington