A library branch, branch library or community library is a local library that forms part of a larger library system, using the same library classification for its catalogs and is interconnected with all the other branches of the system through an integrated library system.

Some countries' municipalities have their own library system, such as London Public Library (Canada) with 16 library branches, Helsinki Metropolitan Area Libraries (Finland) with 63 libraries,^[1] and the National Library of Venezuela with 685 branches.

Some popular library branches include New York Public Library Main Branch, part of New York Public Library System, and Martin Luther King Jr. Memorial Library, a branch of District of Columbia Public Library System.