Sister Mary Noel Menezes OR (14 July 1930 – 31 August 2022) was a Guyanese Roman Catholic nun and historian of Portuguese descent.

She taught briefly at Sacred Heart College, North Carolina, and then in 1967 took up an appointment as a lecturer in the Department of History at the fledgling University of Guyana.

In 1970, Menezes won a Ford Foundation scholarship to study at the University of London, where she completed a PhD (conferred 1973) on British policy towards Guyanese Amerindians in the 19th century.

[3] In 1973, Menezes oversaw the creation of a Master of Arts program in Guyanese history, the first postgraduate degree offered by the University of Guyana.

[6] From 1968 to 2003, Menezes ran the St John Bosco Orphanage in Plaisance, for boys aged three to sixteen.