Sir Michael Patrick Cashin, KBE (29 September 1864 in Cape Broyle, Newfoundland – 30 August 1926) was a Newfoundland businessman and politician. He was elected to the legislature in 1893 as an independent but worked closely with the Liberal Party. In 1907 he joined the Newfoundland People's Party of Sir Edward Patrick Morris and became minister of finance in 1909. When Morris resigned as party leader Cashin succeeded him.