The Milwaukee County Federated Library System (MCFLS) is a public library organization that coordinates activities between its member public libraries, which collectively serve the Milwaukee metropolitan area.

It is governed by a board of trustees and funded by the State of Wisconsin and each member library.

[1] The MCFLS provides a number of useful services to any person who is a member of one of its libraries.

The MCFLS also provides administration services to each of its member libraries, such as assisting with technical upgrades, submitting annual reports, purchasing subscription database services, and providing continuing education opportunities.

[2] Membership in the MCFLS consists of the following public libraries in Milwaukee County: