Oceanside is a census-designated place (CDP) and unincorporated community in Tillamook County, Oregon, United States. The population was 361 at the 2010 census. Oregon Route 131's northern terminus is in the community, which is just north of Netarts. Symons State Park is in Oceanside, while Three Arch Rocks National Wildlife Refuge lies just offshore.

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.