Ilbert II de Lacy (died 1141), Baron of Pontefract and Lord of Bowland, was an English noble.
Ilbert with his father, supported Robert Curthose against the claims of Henry I to the English crown.
Upon Henry’s succession, he dispossessed the Lacy’s of all their estates and banished Robert and Ilbert from England.
He disappears from records shortly afterwards, possibly dying in captivity or from wounds suffered during the battle.
Ilbert died without issue and his brother Henry, succeeded to his titles.