Lambert II, Count of Louvain

{{Short description|Count of Leuven from 1033 to 1054}}

{{Infobox nobility|

| name =Lambert II

| title =Count of Louvain

| image =Balderic2.jpg

| spouse =Oda of Verdun

| issue =Henry II, Count of Louvain
Régnier
Gerberge

| noble family =House of Reginar

| father =Lambert I, Count of Louvain

| mother =Gerberga of Lower Lorraine

| birth_date =

| birth_place =

| death_date =19 June 1054

| death_place =Tournai

|}}

Lambert II (died Tournai, 19 June 1054) was count of Leuven between 1033 and 1054. Lambert was the son of Lambert I of Louvain and Gerberga, daughter of Charles, Duke of Lower Lorraine.{{sfn|Bachrach|Bachrach|Leese|2018|p=xvi}}

According to the [http://la.wikisource.org/wiki/Vita_Gudilae 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. He was defeated and lost his life at Tournai.

During his reign, Brussels began its growth. Lambert arranged to transfer the remains of Saint Gudula to the Church of St. Michael. This church, thereafter known as the Church of St. Michael and St. Gudula, later became the Cathedral of St. Michael and St. Gudula. Lambert also constructed a fortress on the Coudenberg hill.

Lambert II died in 1054.