Boris Dilliès, born on 26 December 1972 in Uccle, is a member of the Mouvement Réformateur (MR). He has served as Minister-President of the Brussels-Capital Region since 14 February 2026.
Dilliès holds a graduate degree in public relations from the School of Continuing Education and Training (EPFC) and is a lecturer at the European Communication School in Uccle.
In 1997, he was elected to the Uccle municipal council, where he became a counselor at the Public Centre for Social Welfare (CPAS). At the same time, from 1995 to 2000, he worked as an attaché in the office of Éric André, then Secretary of State in the Brussels-Capital Region government. He later held the same position from 2000 to 2003 in the office of Brussels Minister-President François-Xavier de Donnea.
From 2002 to 2007, he worked at Wolters Kluwer, where he was responsible for project development, and from 2010 to 2012, he served as communications director of the Cercle de Lorraine. Since 2011, he has also taught media institutions and sociology at the European Communication School in Uccle.
Following the death of Éric André in September 2005, Dilliès was elected alderman of Uccle, responsible for finance and religious affairs. During the 2006–2012 term, he remained alderman for finance, also overseeing the economy, SMEs, youth, sports, extracurricular activities, green spaces, and urban planning.
After the 2012 municipal elections, Boris Dilliès continued to serve as Uccle alderman for finance, economy and commerce, youth, and as a civil registrar under mayor Armand De Decker.
Since January 2013, Dilliès has also been vice-president of the MR federation for the Brussels-Capital Region.
In the May 2014 elections, Dilliès was elected to the Parliament of the Brussels-Capital Region, where he chaired the infrastructure committee from 2014 to 2017.
In 2017, he was re-elected vice-president of the Brussels MR and succeeded Armand De Decker as mayor of Uccle, a position he retained after the 2018 and 2024 elections.
After his election in Uccle, he resigned from his regional parliamentary mandate at the end of January 2018. That same month, the Uccle MR section appointed him to lead and assemble the list for the October 2018 municipal elections, after which he remained one of the two MR mayors in the Brussels-Capital Region. He was sworn in on 26 November 2018.
In the May 2019 regional elections, he was elected to the Brussels Parliament but chose not to take his seat in order to remain a full-time mayor.
In 2026, after an exceptionally long government formation process lasting more than 600 days, he was appointed Minister-President of the Brussels-Capital Region.
