Réseau de transport de Longueuil (RTL) (English: Longueuil Transit Network) is a public transit system in the city of Longueuil, Quebec, Canada, and nearby communities on the South Shore of Montreal. The RTL had an annual ridership of 34,447,686 in 2013.^[1]

RTL was officially inaugurated on July 1, 1974, as Commission de transport de la Rive-Sud de Montréal (CTRSM), replacing the former privately owned company Chambly Transport. It served the former communities of Boucherville, Brossard, Greenfield Park, Longueuil, LeMoyne, Saint-Hubert, Saint-Lambert and Notre-Dame-du-Sacré-Cœur (later annexed to Brossard in 1978). From 1985 until 2002 it was named Société de transport de la Rive-Sud de Montréal (STRSM). Following the municipal mergers in 2002, the name officially changed to Société de transport de Longueuil.^[2] Its marketing name is Réseau de transport de Longueuil, to avoid confusion with the Société de transport de Laval.

Some of the "former" municipalities demerged (broke away) from the city of Longueuil on January 1, 2006, as the result of referendums. However, demerged municipalities continue to be served by and to contribute financially to the RTL, since they still belong to the urban agglomeration of Longueuil.

The RTL provides 14 shared taxi routes for residents in certain sectors that are not served by regular bus routes. Shared taxis serve the same stops and accept the same tickets and passes as the bus service. Shared taxis take riders to the nearest transfer point. Each shared taxi route has its own schedule.^[4]

• Réseau de transport métropolitain
• ARTM park and ride lots