- Grimke family papers, 1678-197716
- Gussie Johnson Papers, 1940-20002
- HCAC Research1
- Halley's Comet Project, 1985-19861
- Hampstead and Bethany Cemeteries2
- Harby, Moise, Levy, Moses, Davis Family Photographs1
- Harry and William Birch Collection4
- Harvey Gantt and the Integration of Clemson University21
- Hearing Horry History1
- Hemrick Nathan Salley Family Sheet Music3
- Henrietta Yurchenco Field Recordings, 1970-19713
- Henry Laurens papers, 1747-186024
- Henry Orion Nichols Collection9
- Henry Orion Nichols Collection 2
- Henry William Ravenel Papers, 1739-193513
- Henry William Ravenel, Plants and Planter19
- Herald-Journal Willis Collection18
- Heyward and Ferguson Family Papers, 1806-1923199
- Historic Charleston Foundation Oral History Project3
- Historic Materials of Kings Mountain Battlefield1