- G. Firth mathematic notebook, 1796/17991
- Gaius Dickinson Letters, 1791/19301
- Galt Papers (I), 1745/189216
- Galt Papers (III), 1750/199117
- Gamble Papers, Letters and Photographs, 1774/18861
- Garrett Family Papers, 1786/19281
- Gary Weiner, Collector, Papers, 1773/19381
- Gaspard Monge Portrait Print, 1746/18181
- Geddy-Harris Archive Records, 1773/1959, bulk 1890/19404
- Geo. Gregory Smart collection of Washington and Mount Vernon ephemera, 1793/20174
- George A. Baxter Family papers, 1797/19182
- George Baker Family Genealogy, 1793/19521
- George Couchman Family Papers, 1765/19351
- George Frederick Holmes Papers, 1790/1898, bulk 1842/18871
- George Hancock Correspondence, 1793/17961