Dyaul Island is an island in the Kavieng District of New Ireland Province, Papua New Guinea (PNG). Its area is 100 km2 (39 sq mi). It is part of the Tikana Rural LLG local government area of PNG. There are two languages spoken on Dyaul, not counting the lingua franca, Tok Pisin; Tigak and Tiang. Tigak is widely spoken on the western end of the island in two villages. Tiang is spoken across the remainder of the island.