Reed College is a private liberal arts college in Portland, Oregon, United States. Founded in 1908, Reed is a residential college with a campus in the Eastmoreland neighborhood, Tudor-Gothic style architecture, and a forested canyon nature preserve at its center. Reed alumni include 123 Fulbright Scholars, 73 Watson Fellows, and three Churchill Scholars. Its 32 Rhodes Scholars are the second-most for a liberal arts college. Reed is ranked fourth in the United States for the percentage of its graduates who earn a PhD.

The Reed Institute (the legal name of the college) was founded in 1908 and held its first classes in 1911. Reed is named for Oregon pioneers Simeon Gannett Reed (1830–1895) and Amanda Reed (died 1904). Simeon was an entrepreneur involved in several enterprises, including trade on the Willamette and Columbia Rivers with his close friend and associate, former Portland Mayor William S. Ladd. Unitarian minister Thomas Lamb Eliot, who knew the Reeds from the church choir, is credited with convincing Reed of the need for the school. Reed's will provided for the gift, and Ladd's son, William Mead Ladd, donated 40 acres from the Ladd Estate Company to build the new college. Reed's first president (1910–1919) was William Trufant Foster, a former professor at Bates College and Bowdoin College.

Reed was founded explicitly as a reaction against the "prevailing model of East Coast, Ivy League education", its lack of varsity athletics, fraternities, and exclusive social clubs – as well as its coeducational, nonsectarian, and egalitarian status – intended to foster an intensely academic and intellectual college.

During the 1930s, President Dexter Keezer was concerned about the fraternization among male and female students and the consumption of alcohol by students. A large portion of the Student Council took the position that Oregon's liquor laws did not apply to Reed's campus. Policies restricting the ability of students from visiting the dormitories of the opposite sex were fiercely resisted.

After World War II the college saw its enrollment numbers dramatically increase as veterans began enrolling in the college.

The college has developed a reputation for the political progressivism of its student body.

According to sociologist Burton Clark, Reed is one of the most unusual institutions of higher learning in the United States, featuring a traditional liberal arts and natural sciences curriculum. It requires freshmen to take Humanities 110, an intensive introduction to multidisciplinary inquiry, covering ancient Greece and Rome, the Hebrew Bible and ancient Jewish history, and as of 2019, Ancient Mesoamerica and the Harlem Renaissance. Reed also has a TRIGA research reactor on campus, making it the only school in the United States to have a nuclear reactor operated primarily by undergraduates. Reed also requires all students to complete a thesis (a two-semester-long research project conducted under the guidance of professors) during the senior year as a prerequisite of graduation. Upon completion of the senior thesis, students must also pass an oral defense of ninety minutes related to the thesis topic and how the thesis relates to the larger context of the student's studies.

Reed maintains a 9:1 student-to-faculty ratio.