Michael Cox (2 November 1689 – 28 May 1779) was an Anglican archbishop in Ireland during the 18th century. He is now chiefly remembered for building one of Ireland's most magnificent remaining mansions, Castletown Cox, near Carrick-on-Suir. He married in 1744 Anne O'Brien, daughter of James O'Brien (1695-1771) and his wife Mary Jephson, and granddaughter of William O'Brien, 3rd Earl of Inchiquin and his wife Mary Villiers. She died the following January, aged 22, giving birth to their only son. The marriage though short-lived is said to have been happy, and he did not remarry.