Mary Watson (17 January 1860 – 1881), was an Australian folk heroine.
She was 21 years old and had been married less than eighteen months when she died of thirst on No.
5 Island in the Howick Group off Cape Flattery in Far North Queensland, Australia, in 1881.
She, with her four-month-old baby, Ferrier, and a wounded Chinese workman, Ah Sam, had drifted for eight days and some forty miles in a cut-down ship's water tank, used for boiling sea slugs, after mainland Aborigines had attacked her absent husband's bêche de mer station on Lizard Island.
Her diary describing their last days was found with their remains in 1882, and Mrs Watson became an emblem of pioneer heroism for many Queenslanders.