Collection
- Gaius Dickinson Letters1
- Galt Papers (I)24
- Galt Papers (III)26
- Gamble Papers, Letters and Photographs1
- Garth Family papers11
- Gary Weiner, Collector, Papers1
- Gaspard Monge Portrait Print1
- Genealogy Collection2
- Geo. Gregory Smart collection of Washington and Mount Vernon ephemera5
- George A. Baxter Family papers7
- George Baker Family Genealogy1
- George Couchman Family Papers1
- George Foster Family History1
- George Frederick Holmes Papers1
- George Mason Papers2