Diana Sabine Moussier (Spanish pronunciation: [saˈβine musiˈe]; born 12 July 1968) is a German-born Mexican actress who is best known for her villainous roles in Televisa's telenovelas, such as El privilegio de amar, Entre el amor y el odio, La madrastra, Amar sin limites, Piel de otoño, Amor sin maquillaje, Las tontas no van al cielo, Mi pecado , and Abismo de pasión. She starred as the protagonist in Ni contigo ni sin ti.
Moussier was born on 23 August 1966 in Leverkusen, North Rhine-Westphalia, West Germany. While still a very small child, Moussier and her mother left Europe and immigrated to Mexico. Moussier had a quiet childhood in Mazatlán, Sinaloa, but as a teenager she took an interest in acting and eventually moved to Mexico City, where she attended Televisa's Centro de Educación Artística.
Soon after graduating from CEA, Moussier found work as the co-host of Al ritmo de la noche with Jorge Ortiz de Pinedo. In 1996, she was cast in minor roles in Morir dos veces and Luz Clarita. The following year, Moussier portrayed the pianist Mireya Serrano in María Isabel.