Sir Michael Patrick Cashin, KBE (29 September 1864 – 30 August 1926) was a Newfoundland businessman and politician.

In 1907 he joined the Newfoundland People's Party of Sir Edward Patrick Morris and became minister of finance in 1909.

The People's Party had formed a wartime national government which opposition member William F. Lloyd, a Liberal, had joined as minister of justice.

Despite the fact that Cashin had succeeded Morris as leader of the dominant party, the governor appointed Lloyd to the position of prime minister.

Cashin's government was short-lived, however; the House of Assembly had not seen an election for six years due to the First World War, and a return to the polls was long overdue.