Allegheny College is a private liberal arts college in Meadville, Pennsylvania, United States. Founded in 1815, Allegheny is the oldest college in continuous existence under the same name west of the Allegheny Mountains. It is a member of the Great Lakes Colleges Association and the Presidents' Athletic Conference and it is accredited by the Middle States Commission on Higher Education.

The area where Allegheny College stands was the ancestral land of the Eriechronon people until the Iroquois Confederacy forced them out. Having been displaced from their ancestral lands in what is now Eastern Pennsylvania, the Lenape or Delaware Tribe moved into the now unoccupied region. They formed an alliance with the neighboring Seneca, one of the five tribes that made up the Iroquois Confederacy, and other displaced Lenape. Under the leadership of Chief Custalog, they founded the settlement of Cussewago. This settlement would later be abandoned and claimed by David Mead to become Meadville, Pennsylvania, on May 12, 1788.

Allegheny College was founded in April 1815 by Timothy Alden, a graduate of Harvard's School of Divinity. The college has been affiliated with the United Methodist Church since 1833 but does not integrate religion into the classroom or pedagogy.

The first class, consisting of four male students, began their studies on July 4, 1816, without any formal academic buildings. Within six years, Alden accumulated sufficient funds to begin building a campus. The first building erected, the library, was designed by Alden himself, and is a notable example of early American architecture. Bentley Hall is named in honor of William Bentley, who donated his private library to the college, a collection of considerable value and significance. In 1824, Thomas Jefferson wrote to Alden, expressing the hope that his University of Virginia could someday possess the richness of Allegheny's library. Alden served as president of the college until 1831 when financial and enrollment difficulties forced his resignation. Ruter Hall was built in 1853.

Allegheny began admitting women in 1870, early for a US college; a woman was valedictorian of the Allegheny class of 1875. By the time Ida Tarbell, future journalist, arrived in 1876, nineteen women had attended Allegheny and only two had graduated. Tarbell described Ruter Hall in her writing, "...looking out on the town in the valley, its roofs and towers half hidden by a wealth of trees, and beyond it to a circle of round-breasted hills. Before I left Allegheny I had found a very precious thing in that severe room--the companionship there is in the silent presence of books."

In 1905, Allegheny built Alden Hall as a new and improved preparatory school. Over the decades, the college has grown in size and significance while still maintaining ties to the community.

In 1970, the film Been Down So Long It Looks Like Up to Me based on the Richard Fariña novel was filmed on college grounds.

While the word "Allegheny" is a brand for the college, it is also the name of a county, a river, and a mountain range, and the school has tried to prevent other entities from using this word. For example, Allegheny objected in 2006 when Penn State tried to rename one of its campuses "Allegheny". Allegheny president Richard Cook said 'Allegheny' was "our brand." It sued the Philadelphia's Allegheny Health and Research Foundation in 1997 to change its name.