Collegiate a cappella ensembles are college-affiliated singing groups, primarily in the United States, and, increasingly, the United Kingdom and Ireland, that perform entirely without musical instruments. The groups are typically composed of, operated by, and directed by students. In the context of collegiate a cappella, the term a cappella typically also refers to the music genre performed by pop-centric student singing groups. Consequently, an ensemble that sings unaccompanied classical music may not be considered an a cappella group, even though technically it is performing a cappella.

The Yale Whiffenpoofs is a collegiate a cappella singing group at Yale University. Established in 1909, it is the oldest such group in the United States. Best known for "The Whiffenpoof Song", the group is composed of 14 senior students who compete for admission in the spring of their junior year. Former members include Cole Porter and Jonathan Coulton.