Knight Library is the main facility of the University of Oregon's (UO) library system. It is located on the university's campus in Eugene, Oregon, United States. The library design is emblematic of the architecture of the university's older buildings, and it serves as a hub of student activity. As of 2008 it has a collection of more than 3 million volumes. The library also holds collections of primary sources such as photographs and manuscripts on various topics at the Special Collections & University Archives. It is also a depository for the Federal Depository Library Program. The library was previously known as the Main Library and it was renamed the Knight Library in 1988, in honor of the family of Phil Knight.

The University of Oregon is a public research university in Eugene, Oregon. Founded in 1876, the university also has two Portland locations, and manages a marine station, called the Oregon Institute of Marine Biology, in Charleston; and an observatory, called Pine Mountain Observatory, in Central Oregon.