Alexis Tsipras (Greek: Αλέξης Τσίπρας [aˈleksis ˈt͡sipras]; born 28 July 1974) is a Greek politician who is the founder and leader of the political party ELAS and who served as Prime Minister of Greece from 2015 to 2019 as a member of Syriza. A prominent leftist figure, Tsipras served as the leader of the Greek political party Syriza from 2008 to 2023. Tsipras is the fourth prime minister who has governed in the course of the 2010s Greek government-debt crisis. Originally an outspoken critic of the austerity policies implemented during the crisis, his tenure in office was marked by an intense austerity policy, mostly in the context of the third EU bailout to Greece (2015–18).

Born in Athens in 1974, Tsipras joined the Communist Youth of Greece in the late 1980s and in the 1990s was politically active in student protests against education reform plans, becoming the movement's spokesperson. He studied civil engineering at the National Technical University of Athens, graduating in 2000, and later undertook post-graduate studies in urban and regional planning. He worked as a civil engineer in the construction industry, based primarily in Athens.

From 1999 to 2003, Tsipras served as the secretary of Synaspismos Youth. He was elected as a member of the Central Committee of Synaspismos in 2004 and later the Political Secretariat. In the 2006 local election, he ran as Syriza's candidate for Mayor of Athens, winning 10.5%. In 2008, he was elected as leader of Syriza, succeeding Alekos Alavanos. He was first elected to the Hellenic Parliament representing Athens A in the 2009 election and was re-elected in May and June 2012, subsequently becoming Leader of the Opposition and appointing his own shadow cabinet.

In January 2015, Tsipras led Syriza to victory in a snap legislative election, winning 149 out of 300 seats in the Hellenic Parliament and forming a coalition with the Independent Greeks. On 20 August 2015, seven months into his term as prime minister he lost his majority after intraparty defections, announced his resignation, and called for a snap election to take place the following month. In the September 2015 election that followed, Tsipras led Syriza to another victory, winning 145 out of 300 seats and re-forming the coalition with the Independent Greeks. As prime minister, he oversaw negotiations regarding the Greek government-debt crisis, initiated the Greek bailout referendum, responded to the European migrant crisis, and signed the Prespa agreement. In 2015, he was named by TIME magazine as one of the 100 most influential people globally. Τwo years later however, in 2017, according to the same magazine, he was on the list of the least popular (less than 40% approval rating) heads of government in the world.

After the double defeat of Syriza in both the May and the June 2023 snap elections, Tsipras decided to resign on 29 June 2023. In his resignation statement, he stressed that Syriza had come full circle and that the party needs a profound renewal in order to be able to regain its credibility among citizens, stating: "It would be hypocritical of me to propose the need for a process of profound renewal and refoundation only with my words, if I do not serve it at the same time with my attitude..." In October 2025, he resigned from his post as Syriza MP, and through this move heralded the founding of a new political party. In November 2025, Gutenberg Publications published his political autobiography titled Ithaca.

In 2026, he founded the left-wing political party Hellenic Left Alignment.

Alexios (Alexis) Tsipras was born 28 July 1974 in Athens. His father, Pavlos, was from Athamania in Epirus and was a well-off public works contractor, while his mother, Aristi, was born in Eleftheroupoli, a town in Greek Macedonia. His maternal grandparents were from the village of Babaeski, Eastern Thrace, Turkey and moved to Eleftheroupoli as a result of the 1923 population exchange between Greece and Turkey.

Tsipras joined the Communist Youth of Greece in the late 1980s. In the early 1990s, as a student at Ampelokipoi Multi-disciplinary High School, he was politically active in the student uprising and the school occupations against the controversial law of Education Minister Vasilis Kontogiannopoulos. He rose to prominence as a representative of the student movement when he was featured as a guest on a television show hosted by journalist Anna Panagiotarea. During the interview, Panagiotarea implied that Tsipras was being disingenuous in defending middle and high school students' right to absenteeism without parental notification in the context of protests. Newspapers and opposition politicians contrasted his early activism for the free state education to his choice to enroll his children in private schools when he became prime-minister.^{[citation needed]}