one of the 12 tribes of Israel that in biblical times comprised the people of Israel who later became the Jewish people. The tribe was named after one of the younger sons of Joseph, himself a son of Jacob.

After the death of Moses, Joshua, an Ephraimite, led the Israelites into the Promised Land and assigned territory to each of the 12 tribes. Members of his tribe settled in the fertile, hilly region of central Palestine. They gradually gained great power, for the Ephraimites acted as hosts to the tribal assemblies and had within their borders such religiously important centres as Shiloh and Bethel.

In 930 BC the tribe of Ephraim led the 10 northern tribes in a successful revolt against the south and established the Kingdom of Israel, with Jeroboam I, an Ephraimite, as king. The seventh king of Israel, Ahab (reigned c. 874–c. 853 BC), was also an Ephraimite. His generally peaceful reign was marred by the worship of the Canaanite god Baal by his wife, Jezebel. From about 745 BC, the northern kingdom was often referred to as the Kingdom of Ephraim, a reflection of the tribe's importance. Assyrian conquerors overran the kingdom in 721 BC, dispersing some of the inhabitants and gradually assimilating others, occurrences that account for the eventual disappearance of the tribe of Ephraim along with the nine other northern tribes. They have become known in legend as the Ten Lost Tribes of Israel.