Worshipped solely by the Ironmen in Westeros, the Drowned God's domain is the sea. The religion of the Drowned God is old, dating back to before the Andal invasion. The Andal invaders of the Iron Islands converted to the local religion rather than supplant it with the Seven as they did in the South. The Drowned God religion supports the Ironmen's naval, Viking-like culture. They believe that the Drowned God created them to rape, reave, and carve out kingdoms. The Drowned God himself is believed to have brought flame from the sea and sailed the world with fire and sword. The eternal enemy of the Drowned God is called the Storm God.

Drowning and resurrection feature prominently in the prayers and rituals of the Drowned God religion. Drowning is the traditional method of execution for the Ironmen, but it is also considered a holy act, and the most faithful have no fear of it. Newborn are "drowned" shortly after birth, being submerged into or anointed with saltwater. Clergymen, called Drowned Men, are drowned a second time in earnest and brought back to life with a crude form of cardiopulmonary resuscitation. Drowned Men wear roughspun robes of mottled green, grey, and blue. They carry driftwood cudgels to use in battle, and skins of saltwater to perform ritual anointments. A common prayer is, "What is dead can never die, but rises again, harder and stronger."