A jetway is a moveable bridge, normally enclosed, which extends from an airport terminal. Jetways allow passengers to board an airplane without having to go outside. Prior to the introduction of jetways, passengers would normally board an aircraft by walking along the ground-level tarmac and climbing a set of stairs. Jetways have the ability to swing left or right, to be raised or lowered and extended or retracted, in order to accommodate aircraft of different sizes.

Airport gates with jetways generally have a series of lines painted on the tarmac to assist in parking different types of aircraft in an appropriate position for the jetway operator to dock with the fuselage.

The name "Jetway" is the registered trademark for a specific company's brand of aircraft boarding bridge. In many places, the word jetway has fallen into common usage to mean any bridge used to board an aircraft, regardless of manufacturer. (See genericized trademark).

The word jetway is sometimes used for a high-altitude airway.