Sister Marie Keyrouz (also spelled "Kairouz") is a chanter of Oriental Church music, a member of the Congrégation des Surs Basiliennes Chouérites and founder-president of the National Institute of Sacred Music in Paris.

She was born in Deir el Qamar in Lebanon, close to the Ancient Roman city of Baalbeck. Raised in the Maronite Church, but being a Melkite through her religious congregation, she took holy orders in the Melchite (Byzantine Rite Catholic) Church. From an early age, she undertook several disciplines of study simultaneously, earning a joint doctorate in musicology and anthropology from the Sorbonne in 1991. She has collected a variety of so-called "Oriental" Christian chants, mostly preserved in Greek and Arabic manuscripts and through oral tradition.

Her debut album Chant byzantin took Europe by surprise upon its arrival in 1989, not only with the apparently ancient repertoire it represents, but also due to her own virtuosity, having a great ability to sing the intervals in rapid flourishes, notes that are difficult for most singers to reproduce.

On the production of the various Maronite chants, Melchite Chants, Milanese Chants and even mainstream Gregorian Chants, she is accompanied by L'Ensemble de la Paix, a small band of Arabic instrumentalists which she leads.

Marie Keyrouz is founder of L'Instituit International de Chant Sacré (International Institute of Holy Songs) in Paris, which promotes research into ancient sacred song. She has also written several books.
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