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.

Tillamook County is one of the 36 counties in the U.S. state of Oregon. As of the 2020 census, the population was 27,390. The county seat is Tillamook. The county is named for the Tillamook or Killamook people, a Native American tribe who were living in the area in the early 19th century at the time of European American settlement. The county is located within Northwest Oregon.