| Honorific-Prefix: | Her Excellency |
| Mariana Vieira da Silva | |
| Office: | Minister of the Presidency |
| Primeminister: | António Costa |
| Term Start: | 26 October 2019 |
| Term End: | 2 April 2024 |
| Predecessor: | Herself (as Minister of the Presidency and Administrative Modernisation) |
| Successor: | António Leitão Amaro |
| Office2: | Minister of the Presidency and Administrative Modernisation |
| Primeminister2: | António Costa |
| Term Start2: | 18 February 2019 |
| Term End2: | 26 October 2019 |
| Predecessor2: | Maria Manuel Leitão Marques |
| Successor2: | Herself (as Minister of the Presidency) Alexandra Leitão (as Minister for Administrative Modernisation) |
| Birth Date: | 8 May 1978 |
| Birth Place: | Lisboa, Portugal |
| Party: | Socialist Party |
| Alma Mater: | ISCTE – University Institute of Lisbon |
| Relatives: | José António Vieira da Silva (father) |
| Office3: | Secretary of State Adjunct to the Prime Minister |
| Term Start3: | 26 November 2015 |
| Term End3: | 18 February 2019 |
| Successor3: | Duarte Cordeiro |
| Predecessor3: | Carlos Moedas |
| Primeminister3: | António Costa |
| Constituency4: | Lisbon |
| Term Start4: | 26 March 2024 |
Mariana Guimarães Vieira da Silva (born 8 May 1978[1]) is a Portuguese sociologist and politician who served as Minister of the Presidency in António Costa's XXIII Constitutional Government, effectively in second in the government.[2] [3]
Mariana Vieira da Silva is the daughter of politician José António Vieira da Silva,[4] himself a government minister in the Socialist cabinets of José Sócrates and António Costa, and economist Margarida Guimarães. She has a brother, Miguel Vieira da Silva, who is a musician.[1] In her youth, between the ages of 9 and 19, Vieira da Silva was a competitive swimmer for Sporting CP, specialising in the demanding 200 metres butterfly stroke.[1] [5]
Vieira da Silva earned a licentiate degree in Sociology from ISCTE – University Institute of Lisbon, in 2002,[1] and has not yet concluded her doctorate in Public Policy (she has finished the coursework but has not yet presented her dissertation on the subject of health and education policies in Portugal).[2]
Around the time of the campaign for the 2002 legislative election, Vieira da Silva joined the Socialist Party's political movement Movimento Imaginar Portugal; she became a member of the party shortly after that year's electoral loss.[1] From 2005 to 2009, she worked in an advisory capacity in the office of the Minister of Education Maria de Lurdes Rodrigues. From 2009 to 2011, Vieira da Silva served in an adjunct capacity in the office of the Secretary of State Adjunct to the Prime Minister, José Almeida Ribeiro.[2]
In November 2015, Vieira da Silva became part of the XXI Constitutional Government as Secretary of State Adjunct to the Prime Minister, until February 2019, when she replaced Maria Manuel Leitão Marques (elected Member of the European Parliament) as Minister of the Presidency and of Administrative Modernisation.[2]