Metropolitan Library System

{{about|the library system in the Chicago, Illinois area|the Metropolitan Library System in Oklahoma County, Oklahoma|Metropolitan Library System (Oklahoma)}}

{{Use mdy dates|date=February 2025}}

{{Infobox library

| library_name = Metropolitan Library System

| library_logo = Image:MLS Logo FloatTop.gif

| location = Burr Ridge, IL

| established = 1966

| collection_size = ?

| pop_served = ?

| budget = $?

| director = Susan Bochenski

| num_employees = ?| website = http://www.mls.lib.il.us/

}}

The Metropolitan Library System (MLS) was an association of academic, public, school, and special libraries in Chicago and its suburbs in Cook, DuPage and Will counties. On July 1, 2011, Metropolitan Library System merged with Alliance Library System, DuPage Library System, North Suburban Library System, and Prairie Area Library System to form the Reaching Across Illinois Library System. Sarah Ann Long, director of the North Suburban Library System, summarized the evolution of organizations in northern Illinois in a 2011 essay,"Context is Everything."Long, Sarah Ann. 2011. "Context is everything, follow the money, and change is the natural order." ILA Reporter 29, no. 5: 34-35.