Astoria is a port city and the seat of Clatsop County, Oregon, United States. Founded in 1811, Astoria is the oldest city in the state and was the first permanent American settlement west of the Rocky Mountains. The county is the northwest corner of Oregon, and Astoria is located on the south shore of the Columbia River, where the river flows into the Pacific Ocean. The city is named for John Jacob Astor, an investor and entrepreneur from New York City, whose American Fur Company founded Fort Astoria at the site and established a monopoly in the fur trade in the early 19th century. Astoria was incorporated by the Oregon Legislative Assembly on October 20, 1856.

The city is served by the deepwater Port of Astoria. Transportation includes the Astoria Regional Airport. U.S. Route 30 and U.S. Route 101 are the main highways, and the 4.1-mile (6.6 km) Astoria–Megler Bridge connects to neighboring Washington across the river. The population was 10,181 at the 2020 census.