Henry I of Brabant (French: Henri I de Brabant, Dutch: Hendrik I van Brabant) was (probably) born in 1165 in Leuven and died in the German city of Cologne on September 5, 1235. He became Duke of Brabant in 1183/1184 and succeeded his father as Duke of Lower Lotharingia in 1190. He was the son of Godfrey III of Leuven, Duke of Lower Lotharingia and landgrave of Brabant, and Margaret of Limburg.

He married Maud of Boulogne and Alsace, daughter of Marie of Boulogne and Matthew of Alsace (also called Maud of Flanders) in 1179. He had six children by his first marriage: