Encyclopedias, Almanacs, Transcripts, and Maps
- Giacconi, Riccardo
- Giaever, Ivar
- Giamatti, A. Bartlett
- Giambono, Michele
- Giannotti, Donato
- giant African land snail
- giant magnetoresistance
- giant orders
- giant schnauzer
- giant sequoia
- Giant Sequoia National Monument
- Gibault, Pierre
- Gibbar
- Gibbons, James
- gibbous phase
- Gibbs, Sir Philip
- Gibea
- Gibeah
- Gibraltar, Strait of
- Gibson, John Bannister