Renton Public Library, Public library branch in Renton, Washington, United States

Renton Public Library is a King County Library System branch that sits astride the Cedar River, one of the few libraries in the United States to span a river. The building is about 80 feet (24 m) long and rests on a bridge-like precast concrete girder and tie system riding on pilings. After a 2014–2015 renovation, floor-to-ceiling glass replaced wall-mounted windows, giving views of the water below.

Renton Public Library was built in 1966 as a city library and operated as one until 2010, when it joined the King County Library System after a contested annexation fight. It closed on June 22, 2014 for a $10.2 million renovation that added new pilings into the Cedar River banks for seismic retrofitting and replaced wall-mounted windows with floor-to-ceiling glass. It reopened in August 2015, and the Miller Hull Partnership received the AIA/ALA Library Building Award in 2016 and an AIA Seattle Civic Design Honor Award in 2017 for the work.

The library's name comes from the city of Renton, which surrounds it; the building has no separate name of its own. It was a city-run library from 1966 until 2010, when it joined the King County Library System after a hard-fought annexation vote. Visitors today use it as an ordinary branch: borrowing books, reading at the river-facing glass.

The library spans the Cedar River on pilings, so the reading areas sit directly above the water. Floor-to-ceiling glass installed in the 2014–2015 renovation gives river views and daylight from inside. The building reopened in August 2015 after being closed from June 22, 2014 for the $10.2 million work.

While working in the library, visitors can watch salmon swimming upstream through the Cedar River during their migration. This natural event makes window seating special and connects the visit to the surrounding wildlife.