- G. Sutton Breiding, Poet, Essays, Poems, and Other Material1
- G. William Whitehurst Papers3
- Garlinghouse Home Collection, Ranch Home No. 9540, Built Project, c. 1950s - 20231
- Garnie Walker Testa Papers and Walker-Testa Family Genealogy9
- Gary P. Carpenter collection3
- Gay and Lesbian Student Union (GLSU) Records8
- Gayle Schulman research files2
- Gender, Sexuality, and Women's Studies Program Records2
- Geo. Gregory Smart collection of Washington and Mount Vernon ephemera3
- George Bird Evans Papers2
- George Greenia papers5
- George Grigg and John Carnochan Papers1
- George H. Breiding, Naturalist, Papers8
- George Mason Faculty Senate records3
- George Mason University Athletic Department records1