Sister Mary Noel Menezes OR (14 July 1930 – 31 August 2022) was a Guyanese Roman Catholic nun and historian. She was involved with the University of Guyana from 1967 to her death in 2022, as a lecturer, head of department, full professor, and professor emeritus. She specialised in Guyanese history, particularly that of Amerindians and Portuguese Guyanese.