The Port of Longview is a deep-water port authority located in Longview, on the Columbia River in southwest Washington, United States. It was established in 1921 by Washington state law, and operates as a unit of local government. The port is overseen by a locally elected, three-member board of commissioners. Each commissioner is elected for a six-year term and is directly responsible to the voters for port operations.

Longview is a city in Cowlitz County, Washington, United States. It is the principal city of the Longview, Washington Metropolitan Statistical Area, which encompasses all of Cowlitz County. Longview's population was 37,818 at the time of the 2020 census, making it the largest city in Cowlitz County. The city is located in southwestern Washington, at the junction of the Cowlitz and Columbia rivers. Longview shares a border with Kelso to the east, which is the county seat.