KOIN is a television station in Portland, Oregon, United States, affiliated with CBS. It is owned by Nexstar Media Group alongside Salem–licensed CW owned-and-operated station KRCW-TV. The two stations share studios in the basement of the KOIN Center skyscraper on Southwest Columbia Street in downtown Portland; KOIN's transmitter is located in the Sylvan-Highlands neighborhood of the city.

KOIN Tower is a 155.15 m (509.0 ft), 35-story, skyscraper in Portland, Oregon, United States. The building, the third-tallest in the city, was designed by the firm of Zimmer Gunsul Frasca Partnership and opened in 1984 at a cost of US$48 million.