Nehalem is a city in Tillamook County, Oregon, United States. Incorporated in 1889, the city lies along the Nehalem River and Nehalem Bay near the Pacific Ocean. It is bisected by U.S. Route 101. The population was 355 at the 2020 census.

The Nehalem River is a river on the Pacific coast of northwest Oregon in the United States, approximately 119 miles (192 km) long. It drains part of the Northern Oregon Coast Range northwest of Portland, originating on the east side of the mountains and flowing in a loop around the north end of the range near the mouth of the Columbia River. Its watershed of 855 square miles (2,210 km2) includes an important timber-producing region of Oregon that was the site of the Tillamook Burn. In its upper reaches it flows through a long narrow valley of small mountain communities but is unpopulated along most of its lower reaches inland from the coast.