The Prince George's County Memorial Library System (PGCMLS) is the public library system of Prince George's County, Maryland, United States, in the Washington metropolitan area.

[3][4] There are 19 branch libraries in the Prince George's County Memorial Library System: Accokeek, Baden, Beltsville, Bladensburg, Bowie, Fairmount Heights, Glenarden, Greenbelt, Hillcrest Heights, Hyattsville, Largo-Kettering, Laurel, Mount Rainier, New Carrollton, Oxon Hill, South Bowie, Spauldings, Surratts-Clinton and Upper Marlboro.

The South Bowie branch, the newest library in the county, opened in October 2012.

[5] The library system was established in 1946 "...as a living memorial to those who have made the supreme sacrifice and a testimonial to all those who served in wars."

Services offered by the Prince George's County Memorial Library System include print, audio, video and electronic materials; storytimes and early literacy programs; programs for elementary school students, teens, and adults; book discussions; the Summer Reading Program; author readings and presentations; public PCs and wireless access; electronic databases; technology for loan such as mobile hotspots and Chromebooks; outreach services; books by mail; meeting and conference rooms; passport services; and volunteer opportunities.