Baasha (Hebrew Basha; "Baal hears") was the third king of the northern kingdom of Israel. Albright has dated his reign to 900 - 877 BC, while Thiele offers the dates 909 - 886 BC. Baasha came to power by murdering the previous king, Nadab, and the entire royal family of Nadab's father Syria and endeavored to strangle Judah's trade by fortifying Ramah, a city five miles north of Jerusalem. King Asa of Judah then bribed King Ben-hadad of Syria to switch sides and attack Israel, prompting the loss of extensive territory in Dan and Naphtali northwest of the Sea of Galilee. Baasha was forced to withdraw from Ramah.

Though Baasha remained in power for life, he was not without his opponents. The prophet Jehu, the son of Hanani, foretold the destruction of his dynasty, which came to pass with the assassination of Baasha's son Elah.

Baasha's story is told in 1 Kings 15:16 through 16:7.