This is a list of Portuguese prime ministers by time in office.
Of the 90 prime ministers, 8 have served more than eight years, while 56 have served less than one year.
António Oliveira Salazar served as prime minister for more than 36 years, whereas Francisco Fernandes Costa didn't even serve as prime minister because he refused to take the oath of office.
| Rank by length of terms | Party | Length by time served | Prime ministers |
|---|---|---|---|
| 1 | National Union | 44 years, 93 days | 3 |
| 2 | Regenerator | 38 years, 176 days | 9 |
| 3 | Socialist | 25 years, 211 days | 4 |
| 4 | Social Democratic | 21 years, 239 days (Incumbent) | 8 |
| 5 | Independent | 11 years, 307 days | 25 |
| 6 | Progressist | 10 years, 220 days | 2 |
| 7 | Democratic | 8 years, 279 days | 13 |
| 8 | Historic | 8 years, 123 days | 1 |
| 9 | Reformist | 6 years, 64 days | 2 |
| 10 | Chartist | 2 years, 310 days | 2 |
| 11 | Septemberist | 2 years, 169 days | 4 |
| 12 | Republican | 2 years, 88 days | 4 |
| 13 | Liberal Regenerator | 1 year, 261 days | 1 |
| 14 | Evolutionist Party | 1 year, 40 days | 1 |
| 15 | National Republican | 1 year, 53 days | 3 |
| 16 | Republican Liberal | 273 days | 3 |
| 17 | Nationalist Republican | 245 days | 2 |
| 18 | Democratic Leftwing Republican | 85 days | 1 |
| 19 | Democratic and Social Centre | 36 days | 1 |
| 20 | Chamorro | 23 days | 1 |
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