Balak (Hebrew: בָּלָק Ḇālāq, "etymology uncertain") was a king of Moab described in the Book of Numbers in the Hebrew Bible, where his dealings with the prophet Balaam are recounted. Balak tried to engage Balaam for the purpose of cursing the migrating Israelite community (Numbers 22:1-5). A famous but enigmatic scene in which Balaam talks with a speaking donkey ensues (Numbers 22:21-35). According to Numbers 22:2, and Joshua 24:9, Balak was the son of Zippor.
In the preceding chapter of Numbers, the Israelites, seeking the Promised Land following their Exodus from Egypt, had defeated the Canaanites at a place named Hormah, as well as the Amorites and the people of Bashan, and next approached Moab. The biblical narrative stresses the fears of the people of Moab, who were 'exceedingly afraid' and 'sick with dread' (NKJV) or 'terrified (GNT) (Numbers 22:3). Their fears appear to relate to the size of the Israelite population and the consequent resource depletion which could be expected if they were permitted to occupy Moabite land.
Balak initially conferred with his Midianite allies in order to block Israelite settlement, before sending his elders to seek Balaam's curse on them. The Midianites appear to have been co-located with the Moabites - according to the Targum of Jonathan, they were one alliance of people at this time and therefore had a common interest in preventing Israelite settlement of the area.