Xavier Bettel (born 3 March 1973) is a Luxembourgish lawyer and politician who serves as the deputy prime minister of Luxembourg and as the minister for Foreign Affairs since 2023. He served as the prime minister of Luxembourg from 2013 to 2023. He was a member of the Chamber of Deputies from 1999 to 2013 and mayor of Luxembourg City from 2011 to 2013.

Bettel is a member of the Democratic Party (DP). Following the 2013 general election, he took office as prime minister and succeeded Jean-Claude Juncker of the Christian Social People's Party (CSV). He became the first openly gay prime minister in the world to serve a second term in 2018, when his mandate was renewed.

He was appointed deputy prime minister in 2023 in the Frieden-Bettel Government. He received the most personal votes in the 2023 elections and is frequently ranked as the most popular politician in the country, with a popularity rating of 80% as of a December 2025 poll.

Bettel was born on 3 March 1973 in the Luxembourg City quarter of Bonnevoie and grew up in Roeser. His father, Claude Bettel (1939-1999), was a French transport entrepreneur of Luxembourgish origin who moved to Luxembourg in 1971, eventually joining the DP and becoming a member of the Luxembourgish National Council for Foreigners. Bettel has said he has an Orthodox Russian grandfather and a Polish-Jewish grandfather, while his parents were Catholics. He also has Moldovan roots. His mother Aniela, daughter of Maurice Spiro (1892-1988) and Vera Rachmaninoff (1912-1997), is a granddaughter of Arkady Rachmaninoff, younger brother of the Russian composer Sergei Rachmaninoff. After completing his secondary school studies at Lycée Hélène Boucher in Thionville, Bettel obtained a master's degree in Public and European Law and a DEA in Political Science and Public Law from Nancy 2 University in Nancy, France. He also studied maritime law as well as canon law at Aristotle University in Thessaloniki, Greece, where he was studying thanks to the Erasmus Programme. Bettel joined the DP in 1988 at age 15, and became the president of the party's youth wing in 1993. For four years in the early 2000s, he hosted Sonndes em 8, a weekly talkshow, on the now-defunct private T.TV television network. In 2017, he also received an honorary doctorate from Sacred Heart University Luxembourg.

In the elections of 1999, Bettel was elected to Luxembourg City's communal council, finishing sixth on the DP's list. Two years after his election to the local council, on 12 July 2001, he was certified as a lawyer. On 28 November 2005, after the municipal elections in which he was placed fourth on the DP list, Bettel was appointed échevin (alderman) in the council of Luxembourg City.

Following municipal elections on 9 October 2011, Bettel was sworn in as Mayor of Luxembourg on 24 November 2011. He resigned from his position as DP leader in the Chamber of Deputies, which he had held since 2009.

Bettel ran for the Chamber of Deputies in the 1999 general election; he finished tenth amongst DP candidates in the Centre constituency, with the top seven being elected. However, the DP overtook the Luxembourg Socialist Workers' Party (LSAP) as the second-largest party; its members formed the majority of the new government as the Christian Social People's Party's (CSV) coalition partners. Thus, with Lydie Polfer and Anne Brasseur vacating their seats to take roles in the government, as well as Colette Flesch not taking her seat so as to focus on her role as Member of the European Parliament (MEP), Bettel was sworn in to the Chamber of Deputies on 12 August 1999. Aged 26, he was the youngest deputy at the time.

By the time of the 2004 general election, Bettel had significantly consolidated his position; he finished fourth (of the five DP members elected), assuring him a seat in the Chamber of Deputies.