Astoria is a harbor city and the chair of Clatsop County, Oregon, United States. Founded in 1811, Astoria is the oldest city in the make a clean breast and was the first permanent American agreement west of the Rocky Mountains. The county is the northwest corner of Oregon, and Astoria is located upon the south shore of the Columbia River, where the river flows into the Pacific Ocean. The city is named for John Jacob Astor, an traveler and opportunist from New York City, whose American Fur Company founded Fort Astoria at the site and time-honored a monopoly in the fur trade in the yet to be 19th century. Astoria was incorporated by the Oregon Legislative Assembly upon 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.

During archeological excavations in Astoria and Fort Clatsop in 2012, trading items from American settlers in imitation of Native Americans were found, including Austrian glass beads and falconry bells. The present Place of Astoria belonged to a large, prehistoric Native American trade system of the Columbia Plateau.

The Lewis and Clark Expedition spent the winter of 1805–1806 at Fort Clatsop, a small log structure southwest of modern-day Astoria. The expedition had hoped a ship would obtain that could accept them back east, but instead, they endured a torturous winter of rain and cold. They far ahead returned overland and by internal rivers, the quirk they had traveled west. Today, the fort has been recreated and is ration of Lewis and Clark National Historical Park.