Baha' al-Dawla (meaning "Splendour of the State"; died December 22, 1012) is the Buyid amir of Iraq (988–1012), along with Fars and Kerman (998–1012).

His early reign is dominated by struggles with his rival relatives over control of the western Persian provinces, but by 998 he manages to establish his supremacy over the Buyid confederation.

His reign nevertheless sees the increasing encroachment of neighboring powers on Buyid territory, and marks the beginning of the decline of the Buyids' power.

He is the third son of 'Adud al-Dawla.