The Seattle Public Library (SPL) is the public library system serving Seattle, Washington, USA. It was officially established by the city in 1890, though there had been efforts to start a Seattle library as early as 1868. There are 26 branches in the system, most of them named after the neighborhoods in which they are located. Also included are Mobile Services and the Central Library (opened 2004, designed by Rem Koolhaas). The Seattle Public Library also founded, and until July 2008 administered, the Washington Talking Book & Braille Library (WTBBL).
All but one of Seattle's early purpose-built libraries were Carnegie libraries. Although the central Carnegie library has now twice been replaced, all the early 20th century purpose-built branches survive, although some have been subject to significant alterations. Ballard's former Carnegie library has held a number of restaurants, antique stores, etc., but the others (such as the Fremont Branch and Green Lake Branch) have been modernized, and remain in use as libraries.
As of 2011 the library contained about 930,000 books. Its special collections include an oral history collection, the state document depository, the federal document depository, an aviation history collection, genealogy records, and historical documents about Seattle.