Huon Gulf is a large gulf in eastern Papua New Guinea. It is bordered by Huon Peninsula in the north. Both are named after French explorer Jean-Michel Huon de Kermadec. Huon Gulf is a part of the Solomon Sea. Its northern boundary is marked by Cape Cretin, southern by Cape Longerue. The coast, which quickly increases in elevation from the beach, is bordered by the Rawlinson Range to the north and the Kuper Range to the west, which rises to about 600 m (2,000 ft). More distantly northwest is the Finisterre Range. Lae, capital of the Morobe Province, is located on the northern coast of the gulf.

Markham Bay forms the north-western corner of Huon Gulf, where the Markham River ends.

This body of water is named for 18th Century French military officer Jean-Michel Huon de Kermadec.^{[citation needed]}

The Huon Gulf is a large triangular body of water, marked at the north by Cape Cretin, and counter-clockwise bordered by the Huon Peninsula in the north, and the northwest corner by the Markham River outlet. Continuing the coast continues as a tangent southeasterly to Cape Longerue. To the south of that is Nassau Bay. The east of the Huon Gulf opens out to the Solomon Sea, which in turn is connected to the Pacific Ocean. It is about 55 miles from west to east and 40 miles across.

The Melanesian people around the Huon Gulf have an inimitable physical culture, which includes "apa" wood carvings.

Many of the indigenous peoples speak one of the Oceanic languages. Beyond that, more specific families of languages are contested; these include Huon-Gulf and Markham languages. Papua New Guinea, because of having both language contact from the Gulf and Ocean yet geographical isolation from the mountainous land of one of the largest islands in the world, has the greatest variety of languages in the world. Some of these languages, such as the Numbami language, are "vulnerable" to extinction. Proto-Markham, whose daughter languages are spoken on the Gulf coast and further inland, was proposed by Susanne Holzknecht. They are all part of a proposed grouping of Western Oceanic languages.

The Huon Gulf is ultimately formed by the Australian plate being deformed and pushed beneath the Huon Peninsula. Evidence of this phenomenon is in the morphology (shapes) of the Gulf and surrounding lands, and "both emergent (raised) and submergent (drowned) Corolla reefs associated with the growth of the Finisterre Range, Papua New Guinea."

Due to "the adjacent marine environment" of relatively "small tides," there is little sediment transport into the Huon Gulf.