| Country: | Portugal |
| Type: | presidential |
| Previous Election: | 1918 Portuguese general election |
| Previous Year: | Apr. 1918 |
| Next Election: | 1919 Portuguese presidential election |
| Next Year: | 1919 |
| Election Date: | 16 December 1918 |
| Image1: | João do Canto e Castro - Ilustração Portuguesa 23DEZ1918.png |
| Candidate1: | João do Canto e Castro |
| Party1: | National Republican Party (Portugal) |
| Electoral Vote1: | 137 |
| Percentage1: | 99.28% |
| President | |
| Before Election: | Sidónio Pais |
| Before Party: | National Republican Party (Portugal) |
| After Election: | João do Canto e Castro |
| After Party: | National Republican Party (Portugal) |
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.[1]
The election was held two days after the assassination of the Portuguese president Sidónio Pais on 14 December 1918. There were a total of four candidates. At the first ballot quorum wasn't reached, so the election was repeated, this time with the necessary members present. National 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.