The Spanish Speaking Organization for Community Integrity and Opportunity (SOCIO) photograph collection contains photographs of the organization's "Days of '47" parade float, 1973. There are also two photographs of Fermin R. Lopez and his wife.

The H. Rush Spedden photo collection consists of a stereograph and a panorama of the Western United States.

The Tom and Emmy Spencer digital photograph collection contains 3 images of Tom Spencer skiing in the 1950s and 2 images of the University of Utah Ski Team in 1955.

The David Sperry postcard album contains illustrated color and black-and-white picture postcards depicting various cities in the United States and England dating from approximately 1900 to 1920.

Hillary St. Clair was a graduate of the University of Utah and metallurgist for the U.S. Bureau of Mines from 1935-1972 who authored many publications about American mining. This collection contains photographs, slides, negatives, and data mainly related to St. Clair's research and writing on minerals and mines.

Page Stegner was an author and historian of the American West. The Page Stegner photograph collection contains images of the Stegner houses in Eastend, Saskatchewan, Vermont, and Idaho, as well as images of the North-West Mounted Police in the early twentieth century.

The Edgar Stern digital photograph collection consists mainly of portraits and images of him skiing. Edgar Stern purchased Treasure Mountain Resort in 1968 and turned it into Park City Resort, with an ambitious improvement and expansion plan. Mr. Stern sold Park City Resort in 1975 but acquired 1,700 acres that eventually became Deer Valley.

The Clarence Stevenson photograph collection consists of images surrounding the mining and social life of Eastern Utah during the first half of the 20th century.

George Emery Stewart, Jr. (1906-1990) was a Utah historian whose Tales from Indian Country: Authentic stories and legends from the great Uintah Basin was published posthumously in 1997. This collection contains digital only images from various locations throughout Utah including cliff dwellings, canyons, creeks and rivers, and towns dating from the 1960s and 1970s.

Justin Call Stewart (1912-1992) was a Utah politician and lawyer. The Justin Call Stewart photograph collection contains photographs, negatives, and postcards of Stewart's life, including family, friends, military service, and travels.

The Mark Stiegemeier photograph collection consists of a photograph of Mark Stiegmeier during a freestyle skiing competition and two other miscellaneous photographs.

The James D. Still photograph collection contains images of various headstones, historical Mormon figures and Mormon history sites in Missouri.

Richard Lewis "Dick" Stimson (1925-2014) was a veteran of the United States Army who served in World War II. After retiring from a career in insurance and sales, he volunteered for the University of Utah Health Sciences and hospitals and bequeathed his estate to the University of Utah Health Sciences. This collection contains color photographs of Stimson's life, his military service, and his involvement in veteran organizations and reunions.

The John Stockert photograph collection consists of 594 color 35mm transparencies, dated from 1958 to 1974. All slides are of areas in Utah, mostly southern Utah. Mr. Stockert began to take photographs of southern Utah while working as a seasonal Park Ranger in Arches National Monument (later National Park) in 1960, and later visited and photographed other parts of Utah in subsequent years.

The Jean C. Stockton photograph collection contains photographs of Salt Lake City and surrounding areas taken by Vera Collett Middleton.

The Msgr Jerome Stoffel photograph collection consists of 35mm slides taken throughout the professional career of Stoffel. The primary focus is on various trips to the holy land and european points of religious interest. Another major element to the collection is a varied assembly of images from trips throughout the southwest United States focusing primarily on California and Utah.

Walter M. Stookey (1869-1951) was a Utah medical doctor and historian who specialized in the Donner-Reed party. Stookey was a member of the Utah Trails and Landmarks Association and was involved in locating and marking trails and routes across the state. This colleciton contains photographs documenting Stookey's interest in the Donner Party and involvement in marking and memorializing the history of westward expansion in the United States.

The Marthinius A. Strand photograph collection is one image of him in his Utah Ski Club sweater on the out run of a jumping hill.

The Charles N . Strevell photograph collection contains images on dinosaurs, Strevell's Museum, and Strevell's book: As I Recall Them.

The Marvin H. Strong photograph collection contains photographs of bands and musicians. Marvin H. Strong was a Utah musician and teacher.