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- Robert A. Gardner, two-time U.S. Amateur golf champion
- Jeffrey Garten, dean of the Yale School of Management (graduated 1964)
- Isaac Wheeler Geer, Railroad Executive
- A. Bartlett Giamatti, President of Yale University and seventh MLB Commissioner (graduated 1956)
- David Graeber, a professor of Anthropology and Anarchist.
- Anthony Grafton, noted scholar (graduated 1967)
- Richard Theodore Greener, first African-American to graduate from Harvard College. (graduated 1865)
- David L. Gunn, former President of Amtrak (graduated 1955)
- Philip F. Gura, William S. Newman Distinguished Professor of American Literature and Culture, University of North Carolina at Chapel Hill (graduated 1968)
Read more about this topic: List Of Phillips Academy Alumni