Martin Cash (baptised 10 October 1808 – 26 August 1877) was a notorious Irish-Australian convict bushranger, known for escaping twice from Port Arthur, Van Diemen's Land.

His 1870 autobiography, The Adventures of Martin Cash, ghostwritten by James Lester Burke, also a former convict, became a best seller in Australia.

When he was 18 years old, he became acquainted with a young woman from Enniscorthy who earned a living by making straw hats and bonnets.

His memoirs describe that, in a jealous rage, he shot at a man named Jessop for making advances to the above-mentioned young lady.

Cash was sentenced to seven years penal transportation, and he left Cork Harbour on board the Marquis of Huntly with 170 other convicts.

[1] Cash was "assigned" to Mr G. Bowman of Richmond, who leased other farms on the Hunter River, where Martin was transferred, and where he became a stockrider for nine years.

Upon Boodle informing him that the strangers knew the cattle were stolen, and that transportation to Norfolk Island was the penalty for this crime, Cash decided to leave for Van Diemen's Land.

Buck and Joan Emberg later transcribed this account from the original manuscript and released it as The Uncensored Story of Martin Cash.