ONE National Gay & Lesbian Archives

ONE National Gay and Lesbian Archives at the University of Southern California Libraries is the oldest existing lesbian, gay, bisexual, and transgender (LGBTQ) organization in the United States and one of the largest repositories of LGBTQ materials in the world. Located in Los Angeles, California, ONE Archives has been a part of the University of Southern California Libraries since 2010. ONE Archives' collections contain over two million items including periodicals; books; film, video and audio recordings; photographs; artworks; ephemera, such as clothing, costumes, and buttons; organizational records; and personal papers. Use of the collections is free during regular business hours.

ONE Archives originated from the One Institute (formerly ONE, Inc. and One Archives Foundation), which began publishing the earliest national homosexual publication in 1952. In 1956, ONE Inc. created the ONE Institute, an academic institute for the study of homosexuality, utilizing the term "Homophile Studies." In 1994, ONE, Inc. and the International Gay and Lesbian Archives run by Jim Kepner merged. The organization has operated solely as an LGBTQ archive since 1994, and it has been a part of the USC Libraries system since 2010.