António Óscar de Fragoso Carmona was a Portuguese Army officer and politician who served as prime minister of Portugal from 1926 to 1928 and as the 11th president of Portugal from 1926 until his death in 1951. He also served as the Minister of War, in late 1923 and in 1926, and as a Minister of Foreign Affairs in 1926.

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