José Mendes Cabeçadas, Portuguese admiral and politician, 9th President of Portugal (died 1965)

José Mendes Cabeçadas Júnior, OTE, ComA, MPCE, commonly known as Mendes Cabeçadas, was a Portuguese Navy officer, Freemason and republican, having a major role in the preparation of the revolutionary movements that created and ended the Portuguese First Republic: the 5 October revolution in 1910 and the 28 May coup d'état of 1926. In the outcome he became the minister of finance for one day only on 30 May 1926, then becoming interim minister for foreign affairs for two days between 30 May and 1 June, after which he again became the minister for finance on the same day. He served as the ninth president of Portugal and prime minister for a brief period of time.

The president of Portugal, officially the president of the Portuguese Republic, is the head of state and highest office of Portugal.