| Monastery of Santa María de Aciveiro | |
| Native Name: | Mosteiro de Santa María de Aciveiro |
| Native Name Lang: | Galician |
| Religious Affiliation: | Catholic Church |
| Patron: | Virgin Mary |
| Location: | Forcarei, Galicia, Spain |
The Monastery of Santa María de Aciveiro (Galician: Mosteiro de Santa María de Aciveiro) is a medieval monastery in Galicia, Spain. It was inhabited from its foundation in the 12th century until the exclaustration caused by the confiscation in 1842.
It was declared a Historical Monument (now known as Bien de Interés Cultural) in 1931.