Boulder Public Library, Public library in Boulder, Colorado.

Boulder Public Library is a five-branch system whose main building on Canyon Boulevard, near Boulder Creek, covers 92,164 square feet in two sections joined by an enclosed walkway over the water. The 1961 James M. Hunter and Associates design has sculpture galleries, reading rooms, video viewing rooms and music listening rooms. The Carnegie Branch for Local History occupies 4,000 square feet downtown; the George Reynolds, Meadows and NoBo branches serve south, east and north Boulder.

The library opened in 1906 in a Carnegie-funded building on Pine Street, built with a $15,000 donation from Andrew Carnegie. In 1959 the City Council approved $450,000 in bonds for a new building on Canyon Boulevard, designed by James M. Hunter and Associates and dedicated on November 12, 1961 at a final cost of $486,437.19. A 2011 referendum funded $2.45 million in renovations that began in 2014, and in November 2022 a referendum created the Boulder Public Library District, separating the library from the city.

The Carnegie Branch for Local History, a 4,000-square-foot building downtown, holds the library's material on Boulder and the surrounding area. The main branch's name comes from the 1906 Carnegie library on Pine Street, funded by Andrew Carnegie's $15,000 donation. Since March 2019 the library has charged no overdue fines.

The main branch sits on Canyon Boulevard near Boulder Creek, and an enclosed walkway links its two sections across the water. The Carnegie Branch for Local History, 4,000 square feet in downtown, is the place for Boulder-area genealogy and archives. Overdue fines were dropped in March 2019, so late returns no longer cost anything.

The library features makerspaces where community members experiment with technological tools and work on hands-on creative projects. These areas allow visitors to learn skills and explore new technologies in a supportive environment.