- Sabichi Family
- Sacks, Benjamin
- Sacks Collection of the American West
- Sacks Collection of the American West (online)
- Saeli, Anthony
- Safeway Grocery Store
- Safford, Anson P.K.
- Saguaro Aviation
- Sahuarita Homemaker’s Club
- Saint John, Silas
- Sam Hughes Parent-Teacher Association
- Samaniego Family
- San Carlos Agency
- San Geronimo Mining District
- Santa Cruz Commercial Compay
- Santa Cruz County
- Santa Cruz Mines & Smelter Company
- Santa Cruz Valley
- Santa Fe Railroad Water Resources
- Santa Rita Hotel
- Santa Rita Land & Mining Company
- Santee, Ross
- Sarle, Clifton James
- Sarrels, Hudson
- Sarrels, Maude J.
- Satterwhite, Thomas
- Saturday Morning Musical Club
- Savory & Foster Families
- Sawyer, Eugene
- Schaus, Richard
- Schieffelin, Edward
- Schmidt, Theodore
- Schneider, Gustav van Hemert
- Schumaker, Ivah
- Scoble, Charles
- Scott, George
- Scott, Thornton & Company
- Scott, William F.
- Seargeant, Helen
- Sedelmayer, Jacobo
- Sells Service Women
- Selmes Family
- Serventi, Luciano
- Sewell, W. Arthur
- Shattuck, Lemuel
- Shaw, Eugene
- Shaw, Maynard
- Shaw, William
- Sherman, Gerald
- Sherman Mines
- Shibell Family
- Sieber, Albert
- Silver City Reduction Works
- Silver King and Florence Telegraph Company
- Sisson Letter Book
- Sisters of St. Joseph of Carondelet
- Skinner, George W.
- Skyline Woman’s Club
- Slaughter, John H.
- Slaughter Ranch
- Small Maps Collection
- Small Manuscripts Collection (Tempe)
- Small Manuscripts Collection (Tucson)
- Small, William A.
- Smalley, George
- Smalley, Harvey
- Smith, Abijah
- Smith, Channing
- Smith, Cornelius C. Jr.
- Smith, David
- Smith, Delos
- Smith District Mines
- Smith, George
- Smith, Gusse Thomas
- Smith, Hoval A. and Nina R.
- Smith, John
- Smith, Joseph
- Smith, Kate
- Smith, Lisle
- Smith, Marcus
- Smith, W. H.
- Snider, Samuel E
- Sobin, Harris J.
- Sociedad Mutua de Obreros Aquiles Serdan
- Society of American Baseball Research
- Sonderegger, Leo
- Sonnichsen, Charles L.
- Sonora & Sinaloa Imprints
- Sons of Union Veterans
- Soroptimist International of Phoenix
- Souter, E. B. G.
- Southern Arizona Bank Alumni Association
- Southern Arizona Hiking Club
- Southern Arizona International Livestock Association
- Southern Arizona School for Boys
- Southern Pacific Railroad
- Southern Pacific Railroad (MS 1412)
- South Park Avenue Improvement Project
- Southwest Experiment Station
- Southwest Forest Industries
- Soza Family
- Spanish-American Democratic Club
- Spanish Colonial Legal Documents
- Spanish Documents
- Spanish, Mexican, and Early American Ruins of Southern Arizona
- Sparkes, Grace
- Sparks, William
- Speed, William
- Spring, John A.
- Springer, Arthur
- Spude, Robert
- St. Elizabeth of Hungary Auxiliary
- St. Louis Gold & Silver Mining Company
- St. Lukes Board of Visitors
- St. Lukes in the Desert
- St. Mary’s Food Bank
- Stacey, May
- Staehle, William
- Stallcup Family
- Stanley, Bruce M.
- Starkweather, Merrit H & Lilly E.
- State Bar Association
- State and County Bar Associations
- Statehood Speeches
- Stauffer, Charles A.
- Stearns, Dana
- Steinfeld Business Records
- Stevens, Daniel C.
- Stevens, Hiram S.
- Steward, Columbus
- Stewart, Albert
- Stiffler, Ethel G.
- Stilwell, William
- Stoddard, Isaac
- Stoner, Victor R.
- Stop Mining Around Tucson (SMART)
- Stowell, Edward
- Strahlmann, Dolores
- Stratton, E. O.
- Stratton Family
- Stratton, Royal
- Streitz, Gustavus
- Strever, Earl
- Strickland, Morgan
- Strode, J.
- Strong, Arturo C.
- Sturgis, Ralph
- Styles, William
- Suess, Ethel
- Sullivan, Muriel K.
- Sulpher Springs Valley Sunday School
- Summers, Richard A.
- Summerhayes, John
- Summerhayes, Martha
- Summerhayes, Martha
- Summers, Richard A.
- Summers, Sue
- Sunshine Church
- Sunshine Climate Club
- Sutherland, Rebecca
- Sutter & Gentry
- Sutter and Strahan Family
- Swain, Ben
- Sykes, Glenton
- Sykes, Godfrey
