Trolleybuses in Mendoza

The Mendoza trolleybus system (Spanish: Sistema de trolebuses de Mendoza) formed part of the public transport network in Mendoza, the capital city of Mendoza Province, Argentina. It is owned by the provincial government.

Opened in 1958, the system expanded to three routes by 1961 and remained relatively static in size and configuration until 1989, when a fourth route opened. Additional routes opened in 2004 and 2005, bringing the system to its maximum extent of six routes, which linked the city center with some of its metropolitan suburbs. However, one of the original routes (Villanueva) was suspended from 2005 to 2011, and consequently no more than five routes were operating concurrently during that period.

In the 2010s, the provincial government entity that had always operated the system, the Empresa Provincial de Transportes de Mendoza (EPTM), began to experience increasingly worsening financial problems, due in large part to difficulties in keeping its fleet of approximately 30-year-old trolleybuses operating reliably. Construction projects around the city, including work on the new Metrotranvía Mendoza light rail system, also disrupted trolleybus service, and the actual number of trolleybuses in service declined considerably.

At the end of 2016, the provincial legislature voted to dissolve EPTM entirely and replace it with a new company, the Sociedad de Transporte de Mendoza (STM), and this change was put into effect on 1 January 2017. All remaining trolleybus service was suspended on 4 May 2017. A plan to make the suspension a permanent closure gave way to one calling for retention of trolleybus service on one route, the Parque route (the system's very first route, dating to 1958), with the other five routes permanently closed. The suspension lasted 16 months, and trolleybus service resumed on the Parque route in January 2019. Service was discontinued again in February 2021.