Mary Hill (1730–1809) was an heiress after whom the town of Maryhill, now a district of Glasgow, was named.

Mary inherited the Gairbraid Estate from her father, Hew Hill, who had no surviving male heirs. In 1763, she married Robert Graham. Generally spoken of as Captain Graham, Robert had been captured by the pirates of Algiers and was their prisoner for some time, being treated as a slave. On his return home there was considerable interest in his adventures and it was said that Mary was