Gregg M. Sinclair Library opened its doors in 1956, it was one of the largest open-stack university libraries in the United States. The library, designed by Lemmon, Freeth & Haines, which has since evolved into the present Architects Hawaii, was dedicated to former university president Gregg M. Sinclair (1942-1955) on May 4, 1956.

Today the Library is a popular destination for UH students, faculty, and staff because they can find more than 100,000 books, magazines, sheet music, videos, CDs, DVDs, audiocassettes, phonodiscs, and other media.