The Secret of Polichinelle (French: Le Secret de Polichinelle) is a 1903 comedy play by the French writer Pierre Wolff.

A Boulevard farce it premiered at the Théâtre du Gymnase in Paris.

A 1904 American version was translated by Mildred Aldrich and staged at the Harlem Opera House.

[1] A respectable middle-class family discover that their adult son has had an illegitimate child with his mistress.

[2] The same year a Swedish version The Family Secret was also produced, directed by Gustaf Molander.