36 years, 82 days António de Oliveira Salazar from 1932 to 1968 11 years, 26 days Fontes Pereira de Melo from 1871 to 1877, 1878 to 1879 and 1881 to 1886 9 years, 356 days Aníbal Cavaco Silva from 1985 to 1995 The shortest time in office was that of Francisco José Fernandes Costa , who was appointed Prime Minister on 15 January 1920 and resigned after having not taken office during the same day, due to protests. 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 time in office [ edit ] Rank by length of terms Prime Minister Length by time served Cabinets Party 1 António de Oliveira Salazar 36 years, 82 days 3 National Union 2 António Maria de Fontes Pereira de Melo 11 years, 26 days 3 Regenerator 3 Aníbal Cavaco Silva 9 years, 356 days 3 Social Democratic 4 José Luciano de Castro 8 years, 288 days 3 Progressist 5 Duke of Saldanha 8 years, 203 days 4 Regenerator 6 Ernesto Hintze Ribeiro 8 years, 131 days 3 Regenerator 7 António Costa 8 years, 128 days 3 Socialist 8 Duke of Loulé 8 years, 123 days 3 Historic 9 António Guterres 6 years, 160 days 2 Socialist 10 José Sócrates 6 years, 101 days 2 Socialist 11 Duke of Terceira 5 years, 290 days 4 Regenerator 12 Marcello Caetano 5 years, 210 days 1 National Union 13 Mário Soares 4 years, 187 days 2 Socialist 14 Pedro Passos Coelho 4 years, 158 days 2 Social Democratic 15 Marquess of Sá da Bandeira 3 years, 310 days 5 Reformist 16 Joaquim António de Aguiar 3 years, 64 days 3 Regenerator 17 Domingos Oliveira 2 years, 166 days 1 National Union 18 Francisco Pinto Balsemão 2 years, 151 days 1 Social Democratic 19 António Maria da Silva 2 years, 132 days 4 Democratic 20 Duke of Ávila 2 years, 119 days 3 Reformist 21 José Manuel Durão Barroso 2 years, 102 days 1 Social Democratic 22 Afonso Costa 1 year, 329 days 3 Democratic 23 António Costa Cabral, Marquess of Tomar 1 year, 312 days 2 Chartist 24 Anselmo José Braamcamp 1 year, 297 days 1 Progressist 25 António Óscar Carmona 1 year, 284 days 1 Independent 26 João Franco 1 year, 261 days 1 Liberal Regenerator 27 Count of Bonfim 1 year, 195 days 1 Septemberist 28 João Crisóstomo 1 year, 95 days 1 Independent 29 José Vicente de Freitas 1 year, 81 days 1 Independent 30 Vasco Gonçalves 1 year, 63 days 1 Independent 31 António José de Almeida 1 year, 40 days 1 Evolutionist Party 32 José Dias Ferreira 1 year, 35 days 1 Independent 33 Bernardino Machado 1 year, 23 days 2 Democratic 34 Sidónio Pais 1 year, 9 days 1 National Republican 35 Duke of Palmela 363 days 3 Chartist 36 Francisco de Sá Carneiro 336 days 1 Social Democratic 37 Francisco Ferreira do Amaral 326 days 1 Independent 38 Teófilo Braga 323 days 1 Republican 39 Domingos Pereira 278 days 3 Democratic 40 José Pinheiro de Azevedo 278 days 1 Independent 41 António de Serpa Pimentel 270 days 1 Regenerator 42 Carlos Mota Pinto 252 days 1 Social Democratic 43 Pedro Santana Lopes 238 days 1 Social Democratic 44 António Rodrigues Sampaio 236 days 1 Regenerator 45 Baron of Ribeira de Sabrosa 222 days 1 Septemberist 46 Venceslau de Lima 222 days 1 Independent 47 Augusto de Vasconcelos 216 days 1 Republican 48 Álvaro de Castro 212 days 1 Nationalist Republican 49 Duarte Leite 207 days 1 Republican 50 Alfredo de Sá Cardoso 205 days 1 Democratic 51 Artur Ivens Ferraz 197 days 1 Independent 52 José de Castro 196 days 1 Democratic 53 Francisco da Veiga Beirão 186 days 1 Regenerator 54 António Granjo 174 days 2 Republican Liberal 55 Maria de Lourdes Pintasilgo 155 days 1 Independent 56 José Jorge Loureiro 154 days 1 Independent 57 Alfredo Rodrigues Gaspar 138 days 1 Democratic 58 Vitorino Guimarães 136 days 1 Democratic 59 Artur de Campos Henriques 106 days 1 Independent 60 Joaquim Pimenta de Castro 106 days 1 Independent 61 António Teixeira de Sousa 101 days 1 Regenerator 62 Tomé de Barros Queirós 99 days 1 Republican Liberal 63 Liberato Pinto 92 days 1 Democratic 64 António Maria Baptista 90 days 1 Democratic 65 Alfredo Nobre da Costa 86 days 1 Independent 66 José Domingues dos Santos 85 days 1 Democratic Leftwing Republican 67 Luís Montenegro 83 days (Incumbent) 1 Social Democratic 68 João Chagas 72 days 1 Republican 69 Adelino da Palma Carlos 63 days 1 Independent 70 António Dias de Oliveira 62 days 1 Septemberist 71 José Relvas 62 days 1 Independent 72 Count of Lumiares 55 days 1 Septemberist 73 Francisco Cunha Leal 53 days 1 Democratic 74 Vítor Hugo de Azevedo Coutinho 47 days 1 Democratic 75 Carlos Maia Pinto 41 days 1 Independent 76 Diogo Freitas do Amaral 36 days 1 Democratic and Social Centre 77 João Tamagnini Barbosa 35 days 1 National Republican 78 Sebastião Sousa Teles 33 days 1 Independent 79 António Ginestal Machado 33 days 1 Nationalist Republican 80 Vasco de Almeida e Costa 30 days 1 Independent 81 Count of Linhares 23 days 1 Chamorro 82 National Salvation Junta 21 days 1 Independent 83 José Ramos Preto 20 days 1 Democratic 84 José Mendes Cabeçadas 20 days 1 Independent 85 Manuel Gomes da Costa 20 days 1 Independent 86 Manuel Maria Coelho 17 days 1 Independent 87 João do Canto e Castro 9 days 1 National Republican 88 Marquess of Valença 1 day 1 Independent 89 Constitutional Junta 1 day 1 Independent 90 Francisco Fernandes Costa less than a day – Republican Liberal
By party [ edit ] 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, 216 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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