Louisa Colpeyn was a Belgian actress, known for her prolific film career, especially in French cinema. She established herself through character roles, often portraying elegant, bourgeois, or upper-class female figures, with a touch of enigma or eccentricity.

Her most iconic performance remains that of Madame Dioz, the unsettling concierge, in Roman Polanski's cult film *The Tenant* (Le Locataire, 1976). She collaborated with other renowned directors, including Luis Buñuel in *The Phantom of Liberty* (Le Fantôme de la Liberté, 1974), where she brought memorable characters to life even in brief appearances. Colpeyn was appreciated for her distinctive screen presence and her ability to make even the most complex characters vivid.