Encyclopedias, Almanacs, Transcripts, and Maps
- Grebes
- Grebes: Podicipediformes
- Greek and Middle Eastern diet
- Greek Mystery Schools
- Greek Texts are Translated into Arabic
- Green Egg
- Green Ideology
- Green, Celia Elizabeth (1935-)
- Greenbank, Richard Kelly (1924-)
- Greenhouse Gases and Greenhouse Effect
- Greenwood, Joseph Albert (1906-1988)
- Gregor Johann Mendel
- Gregor Mendel Discovers the Basic Laws of Heredity while Breeding Pea Plants (1866)
- Gregori Aleksandrovic Margulis
- Gregorio Ricci-Curbastro
- Gregory Blaxland
- Gregory of Rimini
- Gregory of St. Vincent
- Gregory, Anita (Kohsen) (1925-1984)
- Greig cephalopolysyndactyly