Guillaume, Grand Duke of Luxembourg

**Guillaume** (_Guillaume Jean Joseph Marie_; born 11 November 1981) is Grand Duke of Luxembourg. He is the eldest son of Grand Duke Henri and Grand Duchess Maria Teresa. He became grand duke on 3 October 2025 after his father abdicated.

## Early Life and Education

Prince Guillaume was born on 11 November 1981 at the Grand Duchess Charlotte Maternity Hospital in Luxembourg City and is the eldest child of Grand Duke Henri of Luxembourg and his wife, Cuban-born Grand Duchess Maria Teresa. His godparents are Princess Marie Astrid of Luxembourg and Prince Guillaume of Luxembourg. Guillaume has four younger siblings: Prince Felix, Prince Louis, Princess Alexandra and Prince Sebastien.

On 26 April 2012, the court announced the engagement of the Hereditary Grand Duke to the Belgian Countess Stéphanie de Lannoy. They were married on 19 October 2012.

Guillaume and Stéphanie have a son, named Prince Charles of Luxembourg born on 10 May 2020 at the Grand Duchess Charlotte Maternity Hospital, Luxembourg Prince Francois of Luxembourg born on March 27 2023 at Grand Duchess Charlotte Maternity Hospital, Luxembourg City.

## Titles

11 November 1981 — 18 December 2000: His Royal Highness  Prince Guillaume of Luxembourg, Prince of Nassau, Prince of Bourbon-Parma

18 December 2000 — 3 October 2025: His Royal Highness  Prince Guillaume of Luxembourg, The Hereditary Grand Duke of Luxembourg, Prince of Nassau, Prince of Bourbon-Parma

3 October 2025:-present His Royal Highness The Grand Duke of Luxembourg, Prince of Luxembourg, Prince of Bourbon-Parma, Prince of Nassau

### National Honors

• Luxembourg Knight of the Order of the Gold Lion of the House of Nassau (11 November 1981)

• Luxembourg Grand Cross of Order of Adolphe of Nassau  (11 November 1981)

• Luxembourg Grand Cross of the Order of the Oak Crown (23 June 2012)

### Foreign Honors

• Belgium: Grand Cross of the  Order of the Crown (Belgium) (15 October 2019)

• France: Grand Officer of the National Order of Merit (France) (5 March 2015)

• Italy: Knight Grand Cross of the Order of Merit of the Italian Republic (30 January 2009)

• Netherlands: Knight Grand Cross of the Order of Orange-Nassau (21 March 2012)  Recipient of the King Willem-Alexander Inauguration Medal (4/30/2013)

•Portugal: Grand Cross of the Military Order of Aviz (23 May 2017)

• Senegal: Commander of the National Order of the Lion (24 February 2023)

• Slovakia: Grand Officer of the Order of the White Double Cross (7 September 2005)

• United Kingdom: Recipient of the Sandhurst Medal (22 September 2020)

## Infobox (royalty)

- **name**: Guillaume
- **caption**: Guillaume in 2025
- **succession**: Grand Duke of Luxembourg
- **reign**: 3 October 2025 – present
- **cor-type**: Enthronement
- **predecessor**: Henri, Grand Duke of Luxembourg, Henri
- **successor**: Prince Charles of Luxembourg (born 2020), Charles
- **succession1**: Regent of Luxembourg
- **reign-type1**: Regency
- **reign1**: 8 October 2024 – 3 October 2025
- **pre-type1**: Monarch
- **predecessor1**: Henri
- **birth name**: Prince Guillaume of Luxembourg
- **birth place**: Grand Duchess Charlotte Maternity Hospital, Luxembourg City, Luxembourg
- **issue**: Prince Charles of Luxembourg (born 2020), Prince Charles of Luxembourg
 Prince François of Luxembourg (born 2023), Prince François of Luxembourg
- **full name**: Guillaume Jean Joseph Marie
- **house**: Luxembourg-Nassau
House of Bourbon-Parma, Bourbon-Parma
- **father**: Henri, Grand Duke of Luxembourg
- **mother**: María Teresa Mestre y Batista