- Galt Papers (I), 1745/18924
- Galt Papers (III), 1750/19916
- Gaspard Monge Portrait Print, 1746/18181
- Genealogical Society of Southwestern Pennsylvania, Collector, Material regarding Monongalia County Unrecorded Wills, 1726/17811
- George Mason Papers, 1706/18582
- George Mason University Student Government records, 1968/20191
- George Washington Land Survey (Copy), 17501
- George Washington collection, 1654/17996
- George Zimmerman Travel Account, 1744/1760, bulk 17441
- Gideon Macon Family Charts, 1602/19951
- Governor Arch A. Moore Jr. papers, 1950/19891
- Gregory A. Prince Mormon Studies Collection, 1813/20201
- Grigsby-Galt Papers, 1736/1982, bulk 1840/19302