Baldwin III (1130 – 10 February 1163) is king of Jerusalem from 1143 to 1163.

He is the eldest son of Melisende and Fulk of Jerusalem.

He becomes king while still a child, and is at first overshadowed by his mother Melisende, whom he eventually defeats in a civil war.

During his reign, Jerusalem becomes more closely allied with the Byzantine Empire, and the Second Crusade trieds and fails to conquer Damascus.

Baldwin captures the important Egyptian fortress of Ascalon, but also has to deal with the increasing power of Nur ad-Din in Syria.

He dies childless and is succeeded by his brother Amalric.