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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 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
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
Pedro Santana Lopes
238 days
1
Social Democratic
43
António Rodrigues Sampaio
236 days
1
Regenerator
44
Baron of Ribeira de Sabrosa
222 days
1
Septemberist
Venceslau de Lima
222 days
1
Independent
45
Augusto de Vasconcelos
216 days
1
Republican
46
Álvaro de Castro
212 days
1
Nationalist Republican
47
Duarte Leite
207 days
1
Republican
48
Alfredo de Sá Cardoso
205 days
1
Democratic
49
Artur Ivens Ferraz
197 days
1
Independent
50
José de Castro
196 days
1
Democratic
51
Francisco da Veiga Beirão
186 days
1
Regenerator
52
António Granjo
174 days
2
Republican Liberal
53
Maria de Lourdes Pintasilgo
155 days
1
Independent
54
José Jorge Loureiro
154 days
1
Independent
55
Luís Montenegro
144 days (Incumbent)
1
Social Democratic
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 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, 277 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