| SEIU Historical Records | Abstracts |
| SEIU International Convention Photographs | Abstracts |
| SEIU International Jewelry Workers' Union Records | Abstracts |
| SEIU International Vice-Presidents Records | Abstracts |
| SEIU Local 1 Records | Abstracts |
| SEIU Local 32B-32J Records | Abstracts |
| SEIU Local 517M Records | Abstracts |
| SEIU Local 79 Records | Abstracts |
| SEIU Photographs | Abstracts |
| SEIU Publications | Abstracts |
| SEIU Research Department Historical Records | Abstracts |
| SEIU Research Department Records | Abstracts |
| SEIU Secretary-Treasurer's Office: Constitutions and By-Laws Records | Abstracts |
| SEIU Secretary-Treasurer's Office: International Executive Board Records | Abstracts |
| SEIU Secretary-Treasurer’s Office: Affiliate Officers Records | Abstracts |
| William Seraile Papers | Abstracts |
| Brendan Sexton Papers | Abstracts |
| Ann Shafer Papers | Abstracts |
| Albert Shanker Papers | Abstracts |
| Mark Sharwood Papers | Abstracts |
| Horace Sheffield Papers | Abstracts |
| Lillian Sherwood Papers | Abstracts |
| Carl Shier Papers | Abstracts |
| A.G. Shultz Papers | Abstracts |
| Frank Siegel Papers | Abstracts |
| Paul Silver Papers | Abstracts |
| Morag McLeod Simchak Papers | Abstracts |
| Charles J. Simone Papers | Abstracts |
| Bud and Hazel Simons Papers | Abstracts |
| William Simons Papers | Abstracts |
| Luther Slinkard Papers | Abstracts |
| Ernest Smith Papers | Abstracts |
| Howard R. Smith Papers | Abstracts |
| Joseph Smith Papers | Abstracts |
| Stanton and Nancy Smith Papers | Abstracts |
| Sydney D. Smith Papers | Abstracts |
| Joseph Snyder Papers | Abstracts |
| Society of Engineering Office Workers Records | Abstracts |
| Roy Speth Papers | Abstracts |
| Thomas J. Starling Papers | Abstracts |
| Paul Ste-Marie Papers | Abstracts |
| Nicolaas Steelink Papers | Abstracts |
| Lionel Stephan Papers | Abstracts |
| Marc Stepp Papers | Abstracts |
| Marjorie Stern Papers | Abstracts |
| Don Stevens Papers | Abstracts |
| Lynn P. Stoddard Union Cards | Abstracts |
| Stuart Strachan Papers | Abstracts |
| Yale Stuart Papers | Abstracts |
| Maurice Sugar Papers | Abstracts |
