A fieldworker, often referred to as a field researcher or field investigator, is an individual employed in various academic or professional settings to conduct research, collect data, or carry out investigations in real-world environments or "in the field." The term "field" in this context typically refers to a specific geographic location, such as a rural area, a laboratory, a construction site, or any space where research or investigation takes place away from an office or controlled environment.

Fieldworkers often employ systematic and meticulous methodologies to gather information or carry out detailed studies related to their area of expertise. They may utilize a variety of techniques, including surveys, interviews, observations, measurements, or experiments to collect accurate and reliable data.

Fieldworkers are commonly employed in numerous disciplines, such as anthropology, archaeology, sociology, environmental science, geology, and market research to name a few. Their roles vary depending on the field they specialize in, but their main objective is to obtain firsthand knowledge or evidence that contributes to the advancement or understanding of their respective fields.

Fieldwork can involve physically demanding tasks, extended periods in remote locations, and the need to adapt to unfamiliar conditions or cultures. Fieldworkers often work independently or as part of a team, requiring excellent organizational and interpersonal skills to navigate the challenges associated with their work. The data and findings gathered by fieldworkers serve as the basis for analysis, experimentation, or policy development, ultimately contributing to the growth and development of academic or applied knowledge within their respective fields.