This is a list of cities where trolleybuses operate, or operated in the past, as part of the public transport system. The original list has been divided to improve user-friendliness and to reduce article size. Separate lists—separate articles in Wikipedia—have been made for the following countries:

This page also provides references that are applicable to all parts of the complete list.

Bold typeface for a location city indicates an existing trolleybus system, currently in operation (temporary suspensions not counted), or a new system currently under construction.

Notes for the two tunnel trolleybus lines:

Both lines are part of the Tateyama Kurobe Alpine Route. This passes through Chūbu-Sangaku National Park (also known in English as "Japan Alps National Park").

Both lines have since been converted to electric buses and are no longer trolleybuses.

Goods (freight) line (trolleytruck):

Baranovichi