An airport bus, or airport shuttle bus or airport shuttle or Shuttle Bus is a bus used to transport people to and from, or within airports. These vehicles will usually be equipped with larger luggage space, and incorporate special branding. They are also commonly painted with bright colours to stand out among other airport vehicles and to be easily seen by the crews of taxiing aircraft when negotiating the aprons.

A bus is a road vehicle that carries significantly more passengers than an average car or van, but less than the average rail transport. It is most commonly used in public transport, but is also in use for charter purposes, or through private ownership. Although the average bus carries between 30 and 100 passengers, some buses have a capacity of up to 300 passengers. The most common type is the single-deck rigid bus, with double-decker and articulated buses carrying larger loads, and midibuses and minibuses carrying smaller loads. Coaches are used for longer-distance services. Many types of buses, such as city transit buses and inter-city coaches, charge a fare. Other types, such as elementary or secondary school buses or shuttle buses within a post-secondary education campus, are free. In many jurisdictions, bus drivers require a special large vehicle licence above and beyond a regular driving licence.