An office is a space where an organization's employees perform administrative work in order to support and realize objects and goals of the organization. The word "office" may also denote a position within an organization with specific duties attached to it (see officer, office-holder, official); the latter is in fact an earlier usage, office as place originally referring to the location of one's duty. When used as an adjective, the term "office" may refer to business-related tasks. In law, a company or organization has offices in any place where it has an official presence, even if that presence consists of (for example) a storage silo rather than an establishment with desk-and-chair. An office is also an architectural and design phenomenon: ranging from a small office such as a bench in the corner of a small business of extremely small size (see small office/home office), through entire floors of buildings, up to and including massive buildings dedicated entirely to one company. In modern terms an office is usually the location where white-collar workers carry out their functions. According to James Stephenson, "Office is that part of business enterprise which is devoted to the direction and co-ordination of its various activities."

Offices in classical antiquity were often part of a palace complex or of a large temple. The High Middle Ages (1000–1300) saw the rise of the medieval chancery, which was usually the place where most government letters were written and where laws were copied in the administration of a kingdom. With the growth of large, complex organizations in the 18th century, the first purpose-built office spaces were constructed. As the Industrial Revolution intensified in the 18th and 19th centuries, the industries of banking, rail, insurance, retail, petroleum, and telegraphy grew dramatically, requiring many clerks, and as a result more office space was assigned to house their activities. The time-and-motion study, pioneered in manufacturing by F. W. Taylor (1856-1915) led to the "Modern Efficiency Desk" of 1915 with a flat top and drawers below, designed to allow managers an easy view of the workers.[1] However, by the middle of the 20th century, it became apparent that an efficient office required discretion in the control of privacy, and gradually the cubicle system evolved.[2]