António José Martins Seguro (born 11 March 1962) is a Portuguese politician for the Socialist Party (PS). Seguro was Secretary General of the PS from 2011 until September 2014, and he was the leader of the largest opposition party in the Portuguese Parliament.

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António José Seguro
Secretary-General of the Socialist Party
In office 23 July 2011 – 28 September 2014
President	António de Almeida Santos Maria de Belém Roseira
Preceded by	José Sócrates
Succeeded by	António Costa
President of the Parliamentary Group of the Socialist Party
In office 31 March 2004 – 9 March 2005
Preceded by	António Costa
Succeeded by	Alberto Martins
Minister in the Cabinet of the Prime Minister
In office 3 July 2001 – 8 April 2002
Prime Minister	António Guterres
Preceded by	Armando Vara
Succeeded by	José Luís Arnaut
Secretary of State Assistant to the Prime Minister
In office 25 November 1997 – 20 July 1999
Prime Minister	António Guterres
Preceded by	Luís Marques Guedes
Succeeded by	Vitalino Canas
Secretary of State for Youth Affairs
In office 28 October 1995 – 25 November 1997
Prime Minister	António Guterres
Preceded by	Maria do Céu Ramos
Succeeded by	Miguel Fontes
Secretary-General of the Socialist Youth
In office 29 April 1990 – 6 March 1994
Preceded by	José Apolinário
Succeeded by	Sérgio Sousa Pinto
Member of the Assembly of the Republic
In office 10 March 2005 – 8 October 2014
Constituency	Braga
In office 4 April 2002 – 9 March 2005
Constituency	Guarda
In office 7 November 1991 – 31 October 1995
Constituency	Guarda
Member of the European Parliament
In office 20 July 1999 – 2 July 2001
Constituency	Portugal
Personal details
Born	(1962-03-11) 11 March 1962 (age 62) Penamacor, Portugal
Political party	Socialist Party
Spouse	Margarida Maldonado Freitas ​ ​ (m. 2001)​
Children	2
Alma mater	Lisbon University Institute Autonomous University of Lisbon

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Seguro was born on 11 March 1962 in Penamacor. He entered politics at a very young age and became a member of the Portuguese Socialist Party (PS) as a youth. He attended the 1st cycle program in business organization and management at the ISCTE – Lisbon University Institute, but he did not graduate. Seguro has a degree in international relations awarded later by the Autonomous University of Lisbon.

This section needs to be updated. (November 2023)

Seguro became involved in political activities from a very young age, always linked to the Socialist Party (PS). He was successively secretary general of Socialist Youth, president of the National Youth Council and chairman of the Youth Forum of the European Communities. He was first elected to the Portuguese Parliament in 1991, and again eight years later. In 1995, the Socialist Party won the parliamentary elections, leaving the leader António Guterres to form a government. Seguro initially was Secretary of State for Youth and later assistant secretary of State's prime minister. After a cabinet reshuffle he was promoted to Deputy Minister of the Prime Minister. He also played the role of coordinator of the Standing Committee of the Portuguese Socialist Party and president of the Municipal Assembly of Penamacor. In 1999, António Guterres's PS again won the legislative elections and formed the XIV Constitutional Government, but Seguro moved to other functions. The former cabinet member was elected deputy to the European Parliament, between July 1999 and July 2001. In these two years, serving in the parliament, he was an effective member of the Committee on Constitutional Affairs (in these functions he was co-author of the Report on the Treaty of Nice and the Future of the European Union) and a substitute for the Commission for Employment and Social Affairs. He was also president of the Delegation for Relations with Central America and Mexico, vice president of the Socialist Group in the European Parliament and president of the Portuguese Socialist delegation. After leaving Parliament, he returned to the parliament, being reelected in the elections of 2002. He was also appointed member of the National Secretariat of the Socialist Party. After the municipal elections of December 2002, he accumulated these positions with membership in the Municipal Assembly of Gouveia.^[1]

After Prime Minister José Sócrates resigned as PS General Secretary on the election night of 5 June 2011, having lost the general election by a margin higher than expected, Seguro was elected leader of the party on 23 July 2011, winning 68% of the vote; his challenger, Francisco Assis, got 32%.^[2]