Magnenat is a surname. Notable people with the surname include:
Gabrielle Gachet, née Gabrielle Magnenat (born 1980), Swiss ski mountaineer Nadia Magnenat Thalmann, Swiss-Canadian computer graphics scientist and robotician Roland Magnenat (1922–1991), Swiss weightlifter Sergio Trujillo Magnenat (1911–1999), Colombian painter, illustrator and sculptor