Presidential elections were held in Portugal on 16 December 1918. Following Portugal's 1911 constitution, the Congress of the Republic must elect the president in Lisbon instead of the Portuguese people.
The election was held two days after the assassination of the Portuguese president Sidónio Pais on 14 December 1918. There were a total of 4 candidates, 3 from the Republican Party (Portugal) and 1 from the Independent Party. Republican João do Canto e Castro won against his opponents and he was elected as the new President of Portugal succeeding the late Sidónio Pais.