Illana Bay
Iranun Bay
A US Navy helicopter flies over the bay
Illana Bay Location within the Philippines Show map of Mindanao Illana Bay Illana Bay (Philippines) Show map of Philippines
Location	Mindanao Island, Philippines
Coordinates	7°25′N 123°45′E / 7.42°N 123.75°E / 7.42; 123.75
Type	bay
Part of	Moro Gulf
Settlements	Balabagan Cotabato City Datu Blah T. Sinsuat Datu Odin Sinsuat Dimataling Dinas Dumalinao Kapatagan Labangan Malabang Matanog Pagadian Parang Picong San Pablo Sultan Mastura Sultan Naga Dimaporo Tabina Tukuran

Illana Bay, also known as Iranun Bay, is a large bay of the Moro Gulf, off the southwestern coast of Mindanao island in the Philippines.

Illana Bay and Moro Gulf form part of the Celebes Sea.