Lambert II (died Tournai, 19 June 1054) was count of Leuven between 1033 and 1054.

[1] According to the Vita Gudilae (recorded between 1048–1051) he followed his brother Henry I of Louvain as Count of Leuven.

Lambert scorned both temporal and spiritual authorities and in 1054 even took up arms against Holy Roman Emperor Henry III.

Lambert arranged to transfer the remains of Saint Gudula to the St. Michael's church.

[2] Their children were: This biographical article of a European noble is a stub.