Portugal: Heads of Government: 1910-1974 - Archontology
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Portugal: Heads of Government: 1910-1974

The terms of holding the office are defined in accordance with the dates of signing of the decrees on appointment/discharge published in Diário do Governo (1910-1913), Diário do Governo, II Série (1914-1926), and Diário do Governo, I Série (1926-1974).
Presidente do Governo Provisório da República Portuguesa
5 Oct 1910 - 3 Sep 1911 Joaquim Teófilo Braga
Presidente do Ministério
3 Sep 1911 - 12 Nov 1911 João Pinheiro Chagas
12 Nov 1911 - 16 Jun 1912 Augusto César de Almeida Vasconcelos Correia
16 Jun 1912 - 9 Jan 1913 Duarte Leite Pereira da Silva
9 Jan 1913 - 9 Feb 1914 Afonso Augusto da Costa
9 Feb 1914 - 12 Dec 1914 Bernardino Luís Machado Guimarães
12 Dec 1914 - 25 Jan 1915 Vítor Hugo de Azevedo Coutinho
25 Jan 1915 - 15 May 1915 José Joaquim Pereira Pimenta de Castro [1]
15 May 1915 - 29 May 1915 João Pinheiro Chagas  [1]
29 May 1915 - 29 Nov 1915 José Augusto Soares Ribeiro de Castro [2]
29 Nov 1915 - 15 Mar 1916 Afonso Augusto da Costa 
15 Mar 1916 - 25 Apr 1917 António José de Almeida
25 Apr 1917 - 10 Dec 1917 Afonso Augusto da Costa 
11 Dec 1917 - 9 May 1918 Sidónio Pais
9 May 1918 - 15 Dec 1918 position nonexistent [3]
Presidente do Governo
15 Dec 1918 - 16 Dec 1918 João do Canto e Castro
16 Dec 1918 - 23 Dec 1918 office vacant [4]
Presidente do Ministério
23 Dec 1918 - 27 Jan 1919 João Tamagnini de Sousa Barbosa
27 Jan 1919 - 30 Mar 1919 José Carlos de Mascarenhas Relvas
30 Mar 1919 - 29 Jun 1919 Domingos Leite Pereira
29 Jun 1919 - 15 Jan 1920 Alfredo Ernesto de Sá Cardoso
15 Jan 1920 - 15 Jan 1920 Francisco José Fernandes da Costa
15 Jan 1920 - 21 Jan 1920 Alfredo Ernesto de Sá Cardoso 
21 Jan 1920 - 8 Mar 1920 Domingos Leite Pereira 
8 Mar 1920 - 6 Jun 1920 António Maria Baptista
6 Jun 1920 - 26 Jun 1920 José Ramos Preto
26 Jun 1920 - 19 Jul 1920 António Maria da Silva
19 Jul 1920 - 20 Nov 1920 António Joaquim Granjo
20 Nov 1920 - 30 Nov 1920 Álvaro Xavier de Castro
30 Nov 1920 - 2 Mar 1921 Liberato Damião Ribeiro Pinto
2 Mar 1921 - 23 May 1921 Bernardino Luís Machado Guimarães 
23 May 1921 - 30 Aug 1921 Tomé José de Barros Queirós
30 Aug 1921 - 19 Oct 1921 António Joaquim Granjo 
19 Oct 1921 - 5 Nov 1921 Manuel Maria Coelho
5 Nov 1921 - 16 Dec 1921 Carlos Henrique da Silva Maia Pinto
16 Dec 1921 - 6 Feb 1922 Francisco Pinto da Cunha Leal
6 Feb 1922 - 15 Nov 1923 António Maria da Silva 
15 Nov 1923 - 18 Dec 1923 António Ginestal Machado
18 Dec 1923 - 6 Jul 1924 Álvaro Xavier de Castro 
6 Jul 1924 - 22 Nov 1924 Alfredo Rodrigues Gaspar
22 Nov 1924 - 15 Feb 1925 José Domingues dos Santos
15 Feb 1925 - 1 Jul 1925 Vitorino Máximo de Carvalho Guimarães
1 Jul 1925 - 1 Aug 1925 António Maria da Silva 
1 Aug 1925 - 17 Dec 1925 Domingos Leite Pereira 
17 Dec 1925 - 30 May 1926 António Maria da Silva 
30 May 1926 - 17 Jun 1926 Mendes Cabeçadas
17 Jun 1926 - 9 Jul 1926 Gomes da Costa
9 Jul 1926 - 18 Apr 1928 Óscar Carmona
18 Apr 1928 - 8 Jul 1929 José Vicente de Freitas
8 Jul 1929 - 21 Jan 1930 Artur Ivens Ferraz
21 Jan 1930 - 5 Jul 1932 Domingos Augusto Alves da Costa Oliveira
5 Jul 1932 - 11 Apr 1933 António Salazar
Presidente do Conselho de Ministros
11 Apr 1933 - 27 Sep 1968 António Salazar 
27 Sep 1968 - 25 Apr 1974 Marcello José das Neves Alves Caetano

[1] Junta Constitucional (in dissidence):
  14 May 1915 - 17 May 1915 José Maria Mendes Ribeiro Norton de Matos
  14 May 1915 - 17 May 1915 António Maria da Silva 
  14 May 1915 - 17 May 1915 José de Freitas Ribeiro
  14 May 1915 - 17 May 1915 Alfredo Ernesto de Sá Cardoso 
  14 May 1915 - 17 May 1915 Álvaro Xavier de Castro 
[2] Continues in office as Presidente do Ministério from 17 May 1915, acting for the absent incumbent.
[3] The provisions of the decree of 30 Mar 1918 (decreto n.° 3:997) which de facto replaced the Constitution of 1911 and created presidential republic did not provide for appointment of an officer holding the position of head of government.
[4] João do Canto e Castro was elected to the office of Presidente da República and installed on 16 Dec 1918 and is presumed to have ceased to exercise the functions of Presidente do Governo.