Máire Ní Chathasaigh (born 1956) is an Irish harpist and singer. She began playing at only eleven years old, inspired by her family, many of whom are noted musicians from West Cork. She drew heavily on traditional styles, but also created new techniques of ornamentation. She has won the All-Ireland competition at under-fourteen and under-eighteen levels and then, in the mid 1970s, she won the Senior version three years in succession. 
Her 1985 The New-Strung Harp was the first harp album to consist of exclusively Irish traditional dance music. Her stylistic innovations made her famous in the Celtic music scene, and she began teaching in continental Europe and in the United States. She has taught for more than fifteen years at Cúirt Chruitireachta, a school in Termonfeckin, County Louth, organized the Irish Harp Society, Cairde na Cruite. Her arrangements have been collected in two books, The Irish Harper Vols. I and II, and she has an honours degree in Celtic Studies from University College Cork.
Máire also works with the Choir of New College, Oxford and the New English Chamber Orchestra, and she also appeared on the film Driftwood. Among other musicians, she has worked with Celtic pioneer Dan Ar Braz.