The Arnhem trolleybus system is the trolleybus system in the city of Arnhem. It is unique in the Netherlands as the only trolleybus system still operating in that country. It opened on 5 September 1949.
The current network consists of the following routes:
Formerly, route <span style="background-color:#009EE0; color:#FFFFFF;"> 4 </span> was part of the trolleybus network, but it became part of route 2 in 1950, after no more than four months of existence. The current line 4 in Arnhem is a CNG bus, but on a different route. The same goes for route <span style="background-color:#EA6BA1; color:#FFFFFF;"> 9 </span>, which was discontinued in 2002 (divided between routes 5 and 7). The number 9, too, is now used on a different route in the CNG bus network. Route 7 is the second with this number, the first one being a rush hour line running on the central part of line 1.
In December 2023, due to major reconstruction of the Velperweg, line 1 was divided into 1 (served by trolleybuses) and 21 (served by buses). In July 2025, following completion of the roadworks, line 21 started operating with trolleybuses. The lines remained separate to avoid altering the schedules.
Since May 2024, intercity route 352 is also part of the trolleybus network. Trolleybuses operate in battery mode between Wageningen and d'Oude Herbergh (~65% of the route).