An ology is a discipline of study, as indicated by having the -ology suffix. Here is a list of science ologies:

An Alphabetical List of Ologies

Acarology: The study of ticks and mites

Actinobiology: The study of the effects of radiation upon living organisms

Actinology: The study of the effect of light on chemicals

Aerobiology: A branch of biology that studies organic particles transported by the air

Aerology: The study of the atmosphere

Aetiology: The study of the causes of disease

Agrobiology: the study of plant nutrition and growth related to soil

Agrology: The branch of soil science dealing with the production of crops

Agrostology: The study of grasses

Algology: The study of algae; the study of pain

Allergology: The study of the causes and treatment of allergies

Andrology: The study of male health

Anesthesiology: The study of anesthesia and anesthetics

Angiology: The study of the anatomy of blood and lymph vascular systems

Anthropology: The study of humans

Apiology: The study of bees

Arachnology: The study of spiders

Archaeology: The study of past cultures

Archaeozoology: The study of relationships between humans and animals over time

Areology: The study of Mars

Astacology: The study of crawfish

Astrobiology: The study of the origin of life

Astrogeology: The study of the geology of celestial bodies

Audiology: The study of hearing

Autecology: The study of the ecology of individual species

Bacteriology: The study of bacteria

Bioecology: The study of the interaction of life in the environment

Biology: The study of life

Bromatology: The study of food

Cardiology: The study of the heart

Cariology: The study of cells; the study of dental cavities

Cetology: The study of cetaceans (e.g., whales, dolphins)

Climatology: The study of the climate

Coleopterology: The study of beetles

Conchology: The study of shells and of mollusks

Coniology: The study of dust in the atmosphere and its effects on living organisms

Craniology: The study of the characteristics of the skull

Criminology: The scientific study of crime

Cryology: The study of very low temperatures and related phenomena

Cynology: The study of dogs

Cytology: The study of cells

Cytomorphology: The study of the structure of cells

Cytopathology: The branch of pathology that studies diseases on the cellular level

Dendrochronology: The study of the age of trees and the records in their rings

Dendrology: The study of trees

Dermatology: The study of the skin

Dermatopathology: The field of dermatological anatomical pathology

Desmology: The study of ligaments

Diabetology: The study of diabetes mellitus

Dipterology: The study of flies

Ecohydrology: The study of interactions between organisms and the water cycle

Ecology: The study of the relationships between living organisms and their environment

Ecophysiology: The study of the interrelationship between an organism's physical functioning and its environment

Edaphology: A branch of soil science that studies the influence of soil on life

Electrophysiology: The study of the relationship between electric phenomena and bodily processes

Embryology: The study of embryos

Endocrinology: The study of internal secretory glands

Entomology: The study of insects

Enzymology: The study of enzymes

Epidemiology: The study of the origin and spread of diseases

Ethology: The study of animal behavior

Exobiology: The study of life in outer space

Exogeology: The study of the geology of celestial bodies

Felinology: The study of cats

Fetology (foetology): The study of the fetus

Formicology: The study of ants

Gastrology (gastroenterology): The study of the stomach and intestines

Gemology: The study of gemstones

Geobiology: The study of the biosphere and its relations to the lithosphere and atmosphere

Geochronology: The study of the age of the Earth

Geology: The study of the Earth

Geomorphology: The study of present-day landforms

Gerontology: The study of old age

Glaciology: The study of glaciers

Gynecology: The study of medicine relating to women

Hematology: The study of blood

Heliology: The study of the sun

Helioseismology: The study of vibrations and oscillations in the sun

Helminthology: The study of parasitic worms

Hepatology: The study of the liver

Herbology: The study of the therapeutic use of plants

Herpetology: The study of reptiles and amphibians

Heteroptology: The study of true bugs

Hippology: The study of horses

Histology: The study of living tissues

Histopathology: The study of the microscopic structure of diseased tissue

Hydrogeology: The study of underground water

Hydrology: The study of water

Ichnology: The study of fossil footprints, tracks, and burrows

Ichthyology: The study of fish

Immunology: The study of the immune system

Karyology: The study of karyotypes (a branch of cytology)

Kinesiology: The study of movement in relation to human anatomy

Kymatology: The study of waves or wave motions

Laryngology: The study of the larynx

Lepidopterology: The study of butterflies and moths

Limnology: The study of freshwater environments

Lithology: The study of rocks

Lymphology: The study of the lymph system and glands

Malacology: The study of mollusks

Mammalogy: The study of mammals

Meteorology: The study of weather

Methodology: The study of methods

Metrology: The study of measurement

Microbiology: The study of micro-organisms

Micrology: The science of preparing and handling microscopic objects

Mineralogy: The study of minerals

Mycology: The study of fungi

Myology: The study of muscles

Myrmecology: The study of ants

Nanotechnology: The study of machines at the molecular level

Nanotribology: The study of friction on the molecular and atomic scale

Nematology: The study of nematodes (roundworms)

Neonatology: The study of newborn infants

Nephology: The study of clouds

Nephrology: The study of the kidneys

Neurology: The study of nerves

Neuropathology: The study of neural diseases

Neurophysiology: The study of the functions of the nervous system

Nosology: The study of disease classification

Oceanology: The study of oceans

Odonatology: The study of dragonflies and damselflies

Odontology: The study of the teeth

Oncology: The study of cancer

Oology: The study of eggs

Ophthalmology: The study of the eyes

Ornithology: The study of birds

Orology: The study of mountains and their mapping

Orthopterology: The study of grasshoppers and crickets

Osteology: The study of bones

Otolaryngology: The study of the ear and throat

Otology: The study of the ear

Otorhinolaryngology: The study of the ear, nose, and throat

Paleoanthropology: The study of prehistoric people and human origins

Paleobiology: The study of prehistoric life

Paleobotany: The study of prehistoric metaphytes

Paleoclimatology: The study of prehistoric climates

Paleoecology: The study of prehistoric environments by analyzing fossils and rock strata

Paleontology: The study of fossils of ancient life

Paleophytology: The study of ancient multicellular plants

Paleozoology: The study of prehistoric metazoans

Palynology: The study of pollen

Parapsychology: The study of paranormal or psychic phenomena that defy conventional scientific explanations

Parasitology: The study of parasites

Pathology: The study of illness

Petrology: The study of rocks and conditions by which they form

Pharmacology: The study of drugs

Phenology: The study of periodic biological phenomena

Phlebology: A branch of medicine that deals with the venous system

Phonology: The study of vocal sounds

Phycology: The study of algae

Physiology: The study of the functions of living organisms

Phytology: The study of plants; botany

Phytopathology: The study of plant diseases

Phytosociology: The study of the ecology of plant communities

Planetology: The study of planets and solar systems

Planktology: The study of plankton

Pomology: The study of fruits

Posology: The study of drug dosage

Primatology: The study of primates

Proctology: The study of the rectum, anus, colon, and pelvic floor

Psychobiology: The study and psychology of organisms with regard to their functions and structures

Psychology: The study of mental processes in living creatures

Psychopathology: The study of mental illness or disorders

Psychopharmacology: The study of psychotropic or psychiatric drugs

Psychophysiology: The study of the physiological bases of psychological processes

Pulmonology: The study of diseases of the lungs and the respiratory tract

Radiology: The study of rays, usually ionizing radiation

Reflexology: Originally the study of reflexes or of reflex responses

Rheology: The study of flow

Rheumatology: The study of rheumatic diseases

Rhinology: The study of the nose

Sarcology: A subsection of anatomy that studies the soft tissues

Scatology: The study of feces

Sedimentology: A branch of geology that studies sediments

Seismology: The study of earthquakes

Selenology: The study of the moon

Serology: The study of blood serum

Sexology: The study of sex

Sitiology: The study of diet

Sociobiology: The study of the effect of evolution on ethology

Sociology: The study of society

Somatology: The study of human characteristics

Somnology: The study of sleep

Speleology: The study or exploration of caves

Stomatology: The study of the mouth

Symptomatology: The study of symptoms

Synecology: The study of ecological interrelationships

Technology: The study of the practical arts

Thermology: The study of heat

Tocology: The study of childbirth

Topology: The mathematical study of closeness and connectedness

Toxicology: The study of poisons

Traumatology: The study of wounds and injuries

Tribology: The study of friction and lubrication

Trichology: The study of hair and scalp

Typology: The study of classification

Urology: The study of the urogenital tract

Vaccinology: The study of vaccines

Virology: The study of viruses

Volcanology (vulcanology): The study of volcanoes

Xenobiology: The study of nonterrestrial life

Xylology: The study of wood

Zooarchaeology: The study of animal remains from archaeological sites to reconstruct relationships between people, animals, and their environment

Zoology: The study of animals

Zoopathology: The study of animal diseases

Zoopsychology: The study of mental processes in animals

Zymology: The study of fermentation