Irwin Inlet is an inlet in the located on the Great Southern region of Western Australia. It was also known as Quarram Inlet.The inlet receives water from two main sources; Bow River of the north west and Kent River to the north east. The inlet itself discharges into the Southern Ocean via Foul Bay. The inlet is approximately 20 kilometres (12 mi) east of Walpole and 30 kilometres (19 mi) west of Denmark. The South Coast Highway is about 3 kilometres (2 mi) north of the inlet.