| Galeophobia | fear of cats (see list of phobias) |
| Galileo Galilei | Italian mathematician, inventor and astronomer |
| Galiophobia | fear France or French culture (see list of phobias) |
| Gallophobia | fear France or French culture (see list of phobias) |
| Gamophobia | fear of marriage (see list of phobias) |
| Garbology | study of garbage (see list of branches of science) |
| Gastroenterology | study of the digestive system (see list of branches of science) |
| Gastronomy | study of fine dining (see list of branches of science) |
| Gatophobia | fear of cats (see list of phobias) |
| Geliophobia | fear of laughter (see list of phobias) |
| Gelotophobia | fear of being laughed at (see list of phobias) |
| Gemmology | study of gems and jewels (see list of branches of science) |
| Gender Studies | study of gender (see list of branches of science) |
| Genealogy | study of descent of families (see list of branches of science) |
| Genesiology | study of reproduction and heredity (see list of branches of science) |
| genesis | origin |
| Genetics | study of genes (see list of branches of science) |
| Geniophobia | fear of chins (see list of phobias) |
| Genophobia | fear of sexual intercourse (see list of phobias) |
| Genuphobia | fear of knees or the act of kneeling (see list of phobias) |
| Geochemistry | study of chemistry of the earth's crust (see list of branches of science) |
| Geochronology | study of measuring geological time (see list of branches of science) |
| Geography | study of surface of the earth and its inhabitants (see list of branches of science) |
| Geology | study of the rocks of a planet (see list of branches of science) |
| Geomorphogeny | study of the origins of land forms (see list of branches of science) |
| Geoponics | study of agriculture (see list of branches of science) |
| Geotechnics | study of increasing habitability of the earth (see list of branches of science) |
| Gephydrophobia | fear of crossing bridges (see list of phobias) |
| Gephyrophobia | fear of crossing bridges (see list of phobias) |
| Gephysrophobia | fear of crossing bridges (see list of phobias) |
| Gerascophobia | fear of growing old or aging (see list of phobias) |
| Geratology | study of decadence and decay (see list of branches of science) |
| Germanophobia | fear of Germany or German culture. (see list of phobias) |
| Gerocomy | study of old age (see list of branches of science) |
| Gerontology | study of the elderly and aging (see list of branches of science) |
| Gerontophobia | fear of old people or of growing old. (see list of phobias) |
| Geumaphobia | fear of taste (see list of phobias) |
| Geumophobia | fear of taste (see list of phobias) |
| Gigantology | study of giants (see list of branches of science) |
| Glaciology | study of ice ages and glaciation (see list of branches of science) |
| Globophobia | fear of balloons (see list of phobias) |
| Glossology | study of language; study of the tongue (see list of branches of science) |
| Glossophobia | fear of public speaking (see list of phobias) |
| Glyptology | study of gem engravings (see list of branches of science) |
| Gnosiology | study of knowledge; philosophy of knowledge (see list of branches of science) |
| Gnosiophobia | fear of knowledge (see list of phobias) |
| Gnotobiology | study of life in germ-free conditions (see list of branches of science) |
| Graminology | study of grasses (see list of branches of science) |
| Grammatology | study of systems of writing (see list of branches of science) |
| Graphemics | study of systems of representing speech in writing (see list of branches of science) |
| Graphology | study of handwriting (see list of branches of science) |
| Graphophobia | fear of writing or handwriting (see list of phobias) |
| Gromatics | study of surveying (see list of branches of science) |
| Gymnophobia | fear of nudity (see list of phobias) |
| Gynaecology | study of women's physiology (see list of branches of science) |
| Gynephobia | fear of women (see list of phobias) |
| Gynophobia | fear of women (see list of phobias) |
| Gyrostatics | study of rotating bodies (see list of branches of science) |
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