Field work is a general descriptive term for the collection of raw data in the natural and social sciences, such as in archaeology, biology, ecology, environmental science, geology, geography, geophysics, paleontology, anthropology, linguistics, and sociology. It is more technically known to scientific methodologists as field research.

Field work, which is conducted in situ, can be contrasted with laboratory or experimental research which is conducted in a quasi-controlled environment. In survey research, field work refers to face-to-face or telephone interviewing.

Field work may differ depending on whether the subjects of study are in their habitat, alive, dead, or buried in the earth. The excavation of fossils and archaeological sites constitutes field work; so does the interviewing or observation of people to learn their languages, their folklore, and their social structures. Especially when humans themselves are the subject of study, protocols must be devised to reduce the risk of observer bias and the acquisition of too theoretical or idealized explanations of the actual workings of a culture.

Field work (also spelled as fieldwork) may also refer to farm or plantation labor (its original meaning), or to the temporary fortifications used in a battle.

In political campaigns, field work (or "field") refers to official grassroots organizing efforts on the local level and direct, person-to-person voter contact.

Science | Research methods | Evaluation methods

Feltarbejde | Feldforschung | Trabajo de campo | Enquête de terrain | フィールドワーク | 田野調查