- Horace Gilbert Smithy, Jr., M.D. Papers152
- Horlbeck Brothers Records, 1824-18603
- Horry County Archives Center Oral Histories3
- Horry County Historical Society Photograph Collection226
- Horry-Georgetown Technical College Yearbooks11
- Housworth Stereographs Collection82
- Howser House Preservation, Kings Mountain National Military Park592
- Huger Family Papers, 1795-18971
- Hunger in America536
- Hunley Artifact Collection – Personal Artifacts40
- Hunley Artifact Collection – Submarine Components and Tools18
- Hurricane Hazel Photograph Collection30
- Hurricane Hugo Elevation Maps31
- Hurricane Hugo Oral History Collection, 200911
- Hutson Lee Papers, 1858-186515
- Illustrated Newspaper Clippings, 1840-191741
- Images from the Records of the Charleston County Public Library181
- In Camp And At The Front, WW1 Selections, South Carolina Political Collections173
- Independent Republic Quarterly164
- Indexes of Local History and Genealogy22