Da Nang Bay (), formerly known as Tourane Bay, is a bay of the South China Sea along the coast of Da Nang, Vietnam. The bay is entered between the Sán TràPeninsula and the Hải Vân Mountain, 4 miles Northwest.
The bay has an area of , a coastline of and adequate depths of . It offers good shelter at all seasons for vessels of any size. The bottom of the bay is mostly sandy, while some areas have corals and rocks. A layer of mud is immediately above this sandy bottom, making up 80% of the bay's floor.
The port of Da Nang is located in the bay at the mouth of the HÃÂ n River.