1864 in Portugal

Events in the year 1864 in Portugal.

Incumbents

 * Monarch: Louis I
 * Prime Minister: Nuno José Severo de Mendoça Rolim de Moura Barreto, 1st Duke of Loulé

Events

 * 11 September - Legislative election.
 * 29 September – Signing of the Treaty of Lisbon, on boundaries between Spain and Portugal
 * Banco Nacional Ultramarino established

Births

 * 6 June – Alfredo de Sá Cardoso, military officer and politician (died 1950)
 * 11 August – Duarte Leite, historian, mathematician, journalist, diplomat and politician (died 1950)