Milne Bay is a large bay in Milne Bay Province, south-eastern Papua New Guinea. More than 35 kilometres long and over 15 kilometres wide, Milne Bay is a sheltered deep-water harbor accessible via Ward Hunt Strait. It is surrounded by the heavily wooded Stirling Range to the north and south, and on the northern shore, a narrow coastal strip, soggy with sago and mangrove swamps. The bay is named after Sir Alexander Milne.