The House d'Udekem (French: [dyd(ə)kɛm]) is the name of a noble family that has belonged to the nobility of Belgium since 1816.

The origin of the d'Udekem family dates back to the Late Middle Ages, with the earliest member recorded Gooris van Udekem (†1472), who, in 1468, purchased the Lordship of Guertechin in Bossut.

The first elevation of a member of the family to the French nobility took place in 1716, but this branch became extinct in the male line in 1803.

The French Revolution meant the abolition of the family's noble status in 1795, but it was later restored under the rule of King William I of the Netherlands.

Charles Joseph Marie Ghislain, Baron (1921) d'Udekem d'Acoz (1885-1968), Mayor of Proven