| João Tamagnini Barbosa | |
| Order: | Minister for the Colonies |
| Term Start: | 11 December 1917 |
| Term End: | 15 May 1918 |
| Primeminister: | Sidónio Pais |
| Predecessor: | Ernesto Jardim de Vilhena |
| Successor: | Alexandre José de Vasconcelos e Sá |
| Order2: | Minister for War |
| Term Start2: | 11 May 1918 |
| Term End2: | 15 May 1918 |
| Primeminister2: | Sidónio Pais |
| Predecessor2: | Sidónio Pais |
| Successor2: | Amílcar Abreu Mota |
| Order3: | Minister for Interior |
| Term Start3: | 15 May 1918 |
| Term End3: | 9 October 1918 |
| Primeminister3: | Sidónio Pais |
| Predecessor3: | Henrique Forbes Bessa |
| Successor3: | António Bernardino de Sousa Ferreira |
| Office4: | Minister of Finance |
| Term Start4: | 9 October 1918 |
| Term End4: | 23 December 1918 |
| Primeminister4: | Sidónio Pais (October 9, 1918 - December 14, 1918) João do Canto e Castro (14 December 1918 - 23 December 1918) |
| Predecessor4: | Francisco Xavier Esteves |
| Successor4: | Ventura Malheiro Reimão |
| Order5: | Prime Minister of Portugal |
| Term Start5: | 23 December 1918 |
| Term End5: | 27 January 1919 |
| President5: | João do Canto e Castro |
| Predecessor5: | João do Canto e Castro (interim) Sidónio Pais (effective) |
| Successor5: | José Relvas |
| Order6: | Minister for Interior |
| Term Start6: | 23 December 1918 |
| Term End6: | 27 January 1919 |
| Primeminister6: | Himself |
| Predecessor6: | António Bernardino de Sousa Ferreira |
| Successor6: | José Relvas |
| Birth Date: | 30 December 1883 |
| Birth Place: | Portuguese Macau |
| Death Place: | Portugal |
| Party: | Republican Centrist Party later National Republican Party ("Sidonist Party") |
| Spouse: | Maria Luísa da Cunha e Silva |
| Children: | Maria Helena Luís Artur |
| Occupation: | Army officer (Brigadier) and engineer |
João Tamagnini de Sousa Barbosa (30 December 1883 - 15 December 1948), commonly known as João Tamagnini Barbosa (pronounced as /pt/), or Tamagnini Barbosa, was a Portuguese military officer and politician of the Portuguese First Republic (1910–1926). He served as Minister of Interior, Colonies and Finances during the period known as "New Republic", after the coup d'état of the National Republican Party ("Sidonist Party") and the semi-dictatorial government of President/Prime Minister Sidónio Pais, followed by a brief participation in the provisional government of João do Canto e Castro after the assassination of Sidónio Pais.
He briefly served as prime minister, after João do Canto e Castro, from 23 December 1918 to 27 January 1919.
After the 28 May 1926 revolution that installed the Ditadura Nacional (National Dictatorship) regime that would be followed by António de Oliveira Salazar's Estado Novo (New State), he was elected President of the General Assembly of S.L. Benfica on 19 January 1946. Morever, he served as the 18th president of Benfica from 25 January 1947 to 15 December 1948.[1]