Baldwin IV (1108 – 8 November 1171) was count of Hainaut from 1120 to his death.

[1] Also known as Baldwin the Builder, he purchased the property of Ath in 1158 and built the Burbant tower.

He ceded the locality of Braine-la-Willotte, also known as Braine-le-Comte, to the chapter of Sainte-Waudru in 1158.

In 1159, he incorporated the seigniory of Chimay and in 1160 the châtellenies of Valencians and of Ostrevent.

Baldwin IV married Alice,[1] heiress of Namur, and had the following children: This biographical article of a European noble is a stub.