| Garbology |
Study of garbage |
| Gastroenterology |
Study of stomach; intestines |
| Gastronomy |
Study of fine dining |
| Gemmology |
Study of gems and jewels |
| Genealogy |
Study of descent of families |
| Genesiology |
Study of reproduction and heredity |
| Genethlialogy |
The art of casting horoscopes |
| Geochemistry |
Study of chemistry of the earth's crust |
| Geochronology |
Study of measuring geological time |
| Geogeny |
Science of the formation of the earth's crust |
| Geogony |
Study of formation of the earth |
| Geography |
Study of surface of the earth and its inhabitants |
| Geology |
Study of earth's crust |
| Geomorphogeny |
Study of the origins of land forms |
| Geoponics |
Study of agriculture |
| Geotechnics |
Study of increasing habitability of the earth |
| Geratology |
Study of decadence and decay |
| Gerocomy |
Study of old age |
| Gerontology |
Study of the elderly; aging |
| Gigantology |
Study of giants |
| Glaciology |
Study of ice ages and glaciation |
| Glossology |
Study of language; study of the tongue |
| Glyptography |
The art of engraving on gems |
| Glyptology |
Study of gem engravings |
| Gnomonics |
The art of measuring time using sundials |
| Gnosiology |
Study of knowledge; philosophy of knowledge |
| Gnotobiology |
Study of life in germ-free conditions |
| Graminology |
Study of grasses |
| Grammatology |
Study of systems of writing |
| Graphemics |
Study of systems of representing speech in writing |
| Graphology |
Study of handwriting |
| Gromatics |
Science of surveying |
| Gynaecology |
Study of women’s physiology |
| Gyrostatics |
The study of rotating bodies |