Mathilde D'Udekem D'Acoz
- Category : 1973-births
- Type : GP
- Profile : 5/1 - Heretical / Investigator
- Definition : Single
- Incarnation Cross : LAX Distraction 2
Belgian royalty, the wife of King Philippe, who ascended the throne following the abdication of his father, King Albert II, on 21 July 2013. She is the first Belgian-born Queen of the Belgians.
Mathilde married Philippe on 4 December 1999 in Brussels, civilly at the Brussels Town Hall and religiously at the Cathedral of St. Michael and St. Gudula. The couple have four children. Princess Elisabeth, the couple's eldest child, is the first in line to the throne and ahead of her younger brothers and sister, who are second, third, and fourth in line to succeed, owing to a change in Belgian succession laws in 1991, allowing for the eldest child to succeed, regardless of gender.