| Ecclesiology | study of church affairs (see list of branches of science) |
| Ecclesiophobia | fear of church (see list of phobias) |
| Eccrinology | study of excretion (see list of branches of science) |
| Ecology | study of environment (see list of branches of science) |
| Economics | study of material wealth (production, distribution, and consumption of goods and services) (see list of branches of science) |
| Ecophobia | fear of cataclysmic environmental change (see list of phobias) |
| Edaphology | study of soils (see list of branches of science) |
| Egyptology | study of ancient Egypt (see list of branches of science) |
| Eicophobia | fear of home or home surroundings (see list of phobias) |
| Eidology | study of mental imagery (see list of branches of science) |
| Eisoptrophobia | fear of mirrors or of seeing oneself in a mirror (see list of phobias) |
| Ekistics | study of human settlement (see list of branches of science) |
| Electrochemistry | study of relations between electricity and chemicals (see list of branches of science) |
| Electrodynamics | study of the effects arising from the interactions of electric currents with magnets, with other currents, or with themselves (see list of branches of science) |
| Electrology | study of electricity (see list of branches of science) |
| Electromagnetism | study of electromagnetic force (see list of branches of science) |
| Electrophobia | fear of electricity (see list of phobias) |
| Electrostatics | study of static electricity (see list of branches of science) |
| Eleutherophobia | fear of freedom (see list of phobias) |
| Elurophobia | fear of cats (see list of phobias) |
| Embryology | study of embryos (see list of branches of science) |
| Emetology | study of vomiting (see list of branches of science) |
| Emetophobia | fear of vomiting (see list of phobias) |
| Emmenology | study of menstruation (see list of branches of science) |
| Endemiology | study of local diseases (see list of branches of science) |
| Endocrinology | study of glands (see list of branches of science) |
| Energetics | study of energy under transformation within various fields (see list of branches of science) |
| Enetephobia | fear of pins (see list of phobias) |
| Enetophobia | fear of pins (see list of phobias) |
| Engineering studies | study of engineering (see list of branches of science) |
| Enigmatology | study of enigmas (puzzles) (see list of branches of science) |
| Enissophobia | fear of having committed an unpardonable sin or of criticism (see list of phobias) |
| Enochlophobia | fear of crowds (see list of phobias) |
| Enosiophobia | fear of having committed an unpardonable sin or of criticism (see list of phobias) |
| Entomology | study of insects (see list of branches of science) |
| Entomophobia | fear of insects (see list of phobias) |
| Entozoology | study of parasites that live inside larger organisms (see list of branches of science) |
| Enzymology | study of enzymes (see list of branches of science) |
| Eosophobia | fear of dawn or daylight (see list of phobias) |
| Ephebiatrics | study of adolescence (see list of branches of science) |
| Ephebiphobia | fear of teenagers or of young people (see list of phobias) |
| Epidemiology | study of diseases and epidemics (see list of branches of science) |
| Epileptology | study of epilepsy (see list of branches of science) |
| Epistaxiophobia | fear of nosebleeds (see list of phobias) |
| Epistemology | study of grounds of knowledge (see list of branches of science) |
| Epistemophobia | fear of knowledge (see list of phobias) |
| Equinophobia | fear of horses (see list of phobias) |
| Eremology | study of deserts (see list of branches of science) |
| Eremophobia | fear of being alone or lonely (see list of phobias) |
| Ereuthophobia | fear of red lights or blushing or color red (see list of phobias) |
| Ereuthrophobia | fear of blushing (see list of phobias) |
| Ergasiophobia | fear of work or functioning or surgeon’s fear of operating on a patient (see list of phobias) |
| Ergology | study of effects of work on humans (see list of branches of science) |
| Ergonomics | study of people at work (see list of branches of science) |
| Ergophobia | fear of work (see list of phobias) |
| Erotophobia | fear of sexual love or sexual abuse (see list of phobias) |
| Erythrophobia | fear of red lights or blushing or color red (see list of phobias) |
| Erytophobia | fear of red lights or blushing or color red (see list of phobias) |
| Escapology | study of freeing oneself from constraints (see list of branches of science) |
| Eschatology | study of death; final matters (see list of branches of science) |
| Ethnobiology | study of dynamic relationships between peoples (see list of branches of science) |
| Ethnobotany | study of a region's plants and their practical uses through the traditional knowledge of a local culture and people (see list of branches of science) |
| Ethnochoreology | study of dances and its implication in culture (see list of branches of science) |
| Ethnogeny | study of origins of races or ethnic groups (see list of branches of science) |
| Ethnology | study of cultures (see list of branches of science) |
| Ethnomethodology | study of everyday communication and social interaction (see list of branches of science) |
| Ethnomusicology | study of comparative musical systems (see list of branches of science) |
| Ethology | study of natural or biological character (see list of branches of science) |
| Ethonomics | study of economic and ethical principles of a society (see list of branches of science) |
| Etiology | study of causes, especially of disease (see list of branches of science) |
| Etymology | study of origins of words (see list of branches of science) |
| Euphobia | fear of hearing good news (see list of phobias) |
| Eurotophobia | fear of female genitalia (see list of phobias) |
| Euthenics | study of improving living conditions (see list of branches of science) |
| Exobiology | study of extraterrestrial life (see list of branches of science) |
| Exoplanetology | study of exoplanets (see list of branches of science) |
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