L'Inconnu du lac
- Tahun: 2013
- Negara: France
- Genre: Drama, Thriller
- Studio: Les films du Worso, ARTE France Cinéma, Films de Force Majeure, M141
- Kata kunci: 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
- Pengarah: Alain Guiraudie
- Pelakon: Pierre Deladonchamps, Christophe Paou, Patrick d'Assumçao, Jérôme Chappatte, Mathieu Vervisch, Gilbert Traïna