| Magirics |
Art of cookery |
| Magnanerie |
Art of raising silkworms |
| Magnetics |
Study of magnetism |
| Malacology |
Study of molluscs |
| Malariology |
Study of malaria |
| Mammalogy |
Study of mammals |
| Man??ge |
The art of horsemanship |
| Mariology |
Study of the virgin mary |
| Martyrology |
Study of martyrs |
| Mastology |
Study of mammals |
| Mathematics |
Study of magnitude, number, and forms |
| Mazology |
Mammalogy; study of mammals |
| Mechanics |
Study of action of force on bodies |
| Meconology |
Study of or treatise concerning opium |
| Melittology |
Study of bees |
| Mereology |
Study of part-whole relationships |
| Mesology |
Ecology |
| Metallogeny |
Study of the origin and distribution of metal deposits |
| Metallography |
Study of the structure and constitution of metals |
| Metallurgy |
Study of alloying and treating metals |
| Metaphysics |
Study of principles of nature and thought |
| Metapolitics |
Study of politics in theory or abstract |
| Metapsychology |
Study of nature of the mind |
| Meteoritics |
The study of meteors |
| Meteorology |
Study of weather |
| Metrics |
Study of versification |
| Metrology |
Science of weights and measures |
| Microanatomy |
Study of microscopic tissues |
| Microbiology |
Study of microscopic organisms |
| Microclimatology |
Study of local climates |
| Micrology |
Study or discussion of trivialities |
| Micropalaeontology |
Study of microscopic fossils |
| Microphytology |
Study of very small plant life |
| Microscopy |
Study of minute objects |
| Mineralogy |
Study of minerals |
| Molinology |
Study of mills and milling |
| Momilogy |
Study of mummies |
| Morphology |
Study of forms and the development of structures |
| Muscology |
The study of mosses |
| Museology |
The study of museums |
| Musicology |
Study of music |
| Mycology |
Study of funguses |
| Myology |
Study of muscles |
| Myrmecology |
Study of ants |
| Mythology |
Study of myths; fables; tales |