The papers of the Astrophysical Sciences Department represent the original observation records, correspondence, and teaching documents of Princeton astrophysicists from 1835 to 1990.

The American Civil Liberties Union (ACLU) is the pre-eminent civil liberties organization in the United States, utilizing litigation, lobbying, and public education to defend and preserve the individual rights and liberties guaranteed by the U.S. Constitution. These records document the administration and work of the ACLU's national office, regional offices, and legal projects, with particular emphasis on the areas of civil rights, children and women's rights, freedom of speech (and all First Amendment questions), and due process, among many others. The records include case files, correspondence, meeting minutes, research files, and files of staff members. Portions of the records (Subgroup 1; Subgroup 2, Series 2, 3, and 4; Subgroup 3, Subseries 5B) have been digitized and are available for members of the Princeton community to view here. To view the database from outside Princeton University, please see the Guide to the American Civil Liberties Union Records.

The Admission Office has determined who should be allowed to enroll as undergraduates at Princeton University since 1922. The actual composition and the desired composition of each class have been contentious campus issues since the introduction of selective admission. The debates over the value of recruiting and admitting alumni sons, war veterans, athletes, disadvantaged students (especially racial minorities), and women are reflected in the records of the Admission Office. This collection includes a number of reports and minutes, some of which are restricted, news clippings and releases about Princeton admission, historical materials, and a series of Admission Office publications.

The Alumni Association of Princeton University organized the conference ¡Adelante Tigres! Celebrating Latino Alumni at Princeton University in the spring of 2017. The conference brought more than 750 alumni and guests to campus to reflect on and engage with not only the memories of Latino alumni but also the current experiences of Latino students at Princeton. The ¡Adelante Tigres! Collection consists of photographs and other records that Princeton alumni created and maintained during their time as Princeton students. Documented in the collection are a range of student activities, including cultural performances (dance and music), activism, reunions, and graduation. These materials were collected as part of the conference of the same name organized by the Alumni Association.

Abigail Klionsky is a member of the Princeton University undergraduate Class of 2014 who undertook an oral history project on Jewish student life at Princeton as part of her senior thesis. The collection consists of fifteen transcripts of Klionsky's interviews with Jewish alumni and also includes a copy of a transcript of Henry Morgenthau III's interview with David Frisch in 1979.