Lucien-l'Allier is a station on the Orange Line of the Montreal Metro rapid transit system, operated by Société de transport de Montréal (STM). It is located in the borough of Ville-Marie in downtown Montreal, Quebec, Canada.

The station, planned under the name "Aqueduc," was designed by the firm of David, Boulva & Cleve. A sculptural grille by Jean-Jacques Besner covering a ventilation shaft is the only artwork. The metro station is a normal side platform station, with a mezzanine on its eastern end; this is connected to the exit by an extremely deep open shaft. Passengers have to descend the greatest distance to reach the platforms of any station in Montreal (only Charlevoix and Berri-UQAM have deeper platforms, but those stations also have additional platforms that are shallower.)

The station is intermodal with the Agence métropolitaine de transport (AMT)'s commuter train lines; the entrance is connected by an enclosed walkway to Lucien-l'Allier station, a station on the Vaudreuil-Hudson, Blainville-Saint-Jérôme, and Candiac lines. Lucien-l'Allier was built as part of the Bell Centre; it replaced the former Gare Windsor and was initially called Terminus Windsor, but was renamed for the metro station in order to reduce confusion with the still-extant former station. it is also connected to Montreal's underground city.

This station is named for Lucien l'Allier Street, whose name was changed from rue de l'Aqueduc in order to commemorate Lucien l'Allier, chief engineer for the initial network of the Montreal metro, as well as for the construction of Saint Helen's Island and Île Notre-Dame for Expo 67. He had died while the station was under construction. A plaque in the station commemorates him.