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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
Prime Minister
Length by
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
José Pinheiro de Azevedo 278 days
1
Independent
40
António de Serpa Pimentel 270 days
1
Regenerator
41
Carlos Mota Pinto 252 days
1
Social Democratic
42 Luís Montenegro 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
Venceslau de Lima 222 days
1
Independent
46
Augusto de Vasconcelos 216 days
1
Republican
47
Álvaro de Castro 212 days
1
Nationalist Republican
48
Duarte Leite 207 days
1
Republican
49
Alfredo de Sá Cardoso 205 days
1
Democratic
50
Artur Ivens Ferraz 197 days
1
Independent
51
José de Castro 196 days
1
Democratic
52
Francisco da Veiga Beirão 186 days
1
Regenerator
53
António Granjo 174 days
2
Republican Liberal
54
Maria de Lourdes Pintasilgo 155 days
1
Independent
55
José Jorge Loureiro 154 days
1
Independent
56
Alfredo Rodrigues Gaspar 138 days
1
Democratic
57
Vitorino Guimarães 136 days
1
Democratic
58
Artur de Campos Henriques 106 days
1
Independent
Joaquim Pimenta de Castro 106 days
1
Independent
59
António Teixeira de Sousa 101 days
1
Regenerator
60
Tomé de Barros Queirós 99 days
1
Republican Liberal
61
Liberato Pinto 92 days
1
Democratic
62
António Maria Baptista 90 days
1
Democratic
63
Alfredo Nobre da Costa 86 days
1
Independent
64
José Domingues dos Santos 85 days
1
Democratic Leftwing Republican
65
João Chagas 72 days
1
Republican
66
Adelino da Palma Carlos 63 days
1
Independent
67
António Dias de Oliveira 62 days
1
Septemberist
José Relvas 62 days
1
Independent
68
Count of Lumiares 55 days
1
Septemberist
69
Francisco Cunha Leal 53 days
1
Democratic
70
Vítor Hugo de Azevedo Coutinho 47 days
1
Democratic
71
Carlos Maia Pinto 41 days
1
Independent
72
Diogo Freitas do Amaral 36 days
1
Democratic and Social Centre
73
João Tamagnini Barbosa 35 days
1
National Republican
74
Sebastião Sousa Teles 33 days
1
Independent
António Ginestal Machado 33 days
1
Nationalist Republican
75
Vasco de Almeida e Costa 30 days
1
Independent
76
Count of Linhares 23 days
1
Chamorro
77
National Salvation Junta 21 days
1
Independent
78
José Ramos Preto 20 days
1
Democratic
José Mendes Cabeçadas 20 days
1
Independent
Manuel Gomes da Costa 20 days
1
Independent
79
Manuel Maria Coelho 17 days
1
Independent
80
João do Canto e Castro 9 days
1
National Republican
81
Marquess of Valença 1 day
1
Independent
Constitutional Junta 1 day
1
Independent
82
Francisco Fernandes Costa less than a day
–
Republican Liberal
Rank by
Party
Length by
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 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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