Nóirín Ní Riain (born 1951, Caherconlish, County Limerick) is an Irish singer, writer, teacher, theologian and an authority on Gregorian Chant (plainchant, plainsong). She is primarily known for spiritual songs, but also sings Celtic music, Sean-nós and Indian songs. Nóirín plays an Indian harmonium (Surpeti), Shruti box and Feadóg (whistle). She was Artist-in-Residence for Wexford and Laois.