L'Inconnu du lac
- annos singulos: 2013
- Patriam: France
- genus: Drama, Thriller
- Studio: Les films du Worso, ARTE France Cinéma, Films de Force Majeure, M141
- keyword: lake, drowning, detective, cruising, investigation, love, murder, loneliness, male homosexuality, ejaculation, skinny dipping, summer, swimming, mustache, sexual desire, stranger, lgbt, exhibitionism, casual sex, companionship, sunbathing, gay theme
- Director: Alain Guiraudie
- cast: Pierre Deladonchamps, Christophe Paou, Patrick d'Assumçao, Jérôme Chappatte, Mathieu Vervisch, Gilbert Traïna