| Maurice Sugar Papers |
| Yale Stuart Papers |
| Lynn P. Stoddard Union Cards |
| Nicolaas Steelink Papers |
| John Conyers Sr. Papers |
| Paul Sporn Papers |
| Roy Speth Papers |
| Luther Slinkard Papers |
| Marc Stepp Papers |
| William C. Stark Papers |
| Bud and Hazel Simons Papers |
| Paul Silver Papers |
| Irwin Silber Papers |
| A.G. Shultz Papers |
| Carl Shier Papers |
| Lillian Sherwood Papers |
| Warren Shear Papers |
| Leo D. Shaffer Papers |
| SEIU Executive Office: William McFetridge Records |
| SEIU International Vice-Presidents Records |
| SEIU Local 32B-32J Records |
| SEIU Secretary-Treasurer’s Office: Affiliate Officers Records |
| SEIU Secretary-Treasurer's Office: Constitutions and By-Laws Records |
| SEIU Secretary-Treasurer's Office: International Executive Board Records |
| SEIU Executive Office: George Hardy Records |
| SEIU Local 79 Records |
| SEIU International Jewelry Workers' Union Records |
| SEIU Executive Office: Microfilm |
| SEIU Research Department Historical Records |
| SEIU Historical Records |
