This collection documents the traditions, administration, and club activities of the Sigma Theta Tau sorority from 1956 to 2010. Records comprise administrative files, meeting minutes, social event and service activity files, scrapbooks, awards, visual materials, and memorabilia. A small number of administrative documents, minutes, and booklets from the Trinity Sorority Council (TSC) are included among these files.

Collection of exhibition catalogues assembled by William Spurlock, representing work from his time as Director of University Art Galleries at Wright State University in Dayton, Ohio, and Curator of Exhibitions and Contemporary Art at the Santa Barbara Museum of Art in California. All of the catalogues are signed by Spurlock, and inscribed to Trinity University.

This collection consists of material from Susan Russell Marcus representing her involvement with the Learning About Learning Foundation, the creation of the New World Kids summer arts camp at the Aldrich Contemporary Arts Museum, the New World Kids book series, and interview footage of Paul Baker, as well as other projects she contributed to.

The collection consists of administrative files regarding media relations of the center, with a funding prospectus and two annual reports. Additionally there are several published reports produced by the center.

This collection consists of original sketches, prints, and negatives of commissioned campus artwork by Jean Rosow.

This collection consists of architectural sets, plans, drawings, and concepts of various campus buildings. The collection is limited to Trinity's Skyline campus.

This collection consists of files on events held at Laurie Auditorium. Files include planning and promotion documentation. One box contains technical information on the operation of the auditorium.

The Paul Baker Papers consist of correspondence, photographs, administrative records, scripts, playbills, blueprints for theatre construction, periodical clippings and scrapbooks spanning the years 1925-1976 with the bulk of the material concerning the mid-century. The material from the latter years relates to Baker’s tenure at Trinity University, but the majority of the collection is from his years with Baylor University and his work with the Dallas Theatre Center. The collection also contains a small series of Kitty Baker’s correspondence and personal papers.

This collection consists of planning documentation, proceedings, and recordings of the two Earl M. Lewis Symposium on Urban Affairs held at Trinity University in 2004 and 2005. The symposiums were planned and carried out by the Director of the Urban Affairs program, Char Miller, with the assistance of Trinity University trustee and alum Walter Huntley. The first symposium was titled The City: Past, Present and Future which focused on San Antonio. The second symposium was titled A Tale of Two Cities: Atlanta and San Antonio. The symposium was named in honor of Earl M. Lewis, Professor Emeritus at Trinity. Lewis was the founding director of the graduate program in 1968. He was appointed George W. Brackenridge Distinguished Professor of Urban Studies in 1982. Lewis retired from Trinity University in 1990.

This collection consists of issues of the Trinitonian; from its first appearance as a monthly campus magazine and annual in1900, through its present day weekly circulation as the student-run newspaper of Trinity University.

This collection contains material from the former director of public relations, Leon “Tex” Taylor Taylor. The collection includes correspondence, biographical files, development department files, samples of print media, various articles about Trinity University, and assorted event files spanning Taylor’s tenure at Trinity University from 1947 to 1987.

Scrapbook of Claudius Earle Belk's first few years in military service. Includes a log of major events in his life, as well as world events, from 1938 to 1939; photographs of his family and home; photographs, postcards, and real photographic postcards of locations during his training on Parris Island and deployment on the USS Yorktown; other photographs and postcards collected by Belk, predominantly of military subjects; and two maps of his travels.

Collection of newspaper issues from various publishers, focused on North American indigenous issues.

Material related to the Palo Duro Union Presbytery assembled by Reverend Robert D. Nicholson.

Collection of ephemera related to Encino Press or William D. Wittliff. The archival collection accompanies the library's Beretta-Encino Press Collection, consisting of print copies of a majority of the press's publications and other associated works.