António de Serpa Pimentel (1825, Coimbra – 1900) was Prime Minister of Portugal from 14 January to 11 October 1890.
His term in office began as a reaction to the British ultimatum concerning Portuguese colonial policy in southeast Africa.
The signing of the "Treaty of London" later that year, which was intended as a step to resolve the crisis, was viewed as further appeasement of a powerful Britain.
This led to his resignation and the fall of his government.