Lyon is an underground light rail station on the Confederation Line of the O-Train in Ottawa located in the western portion of Ottawa's downtown, specifically at Lyon Street and Queen Street, the latter being the street the line runs under within Ottawa's downtown core.

This stop is projected to have high usage, with access to Sparks Street, the Supreme Court, and the National Archives of Canada.

[3] An entrance is integrated into the Place de Ville complex, giving indoor access to a mid-rise office building, three office towers and two major hotels.

The station features two artworks: With Words as their Actions by PLANT Architect, led by Lisa Rapoport, a metal sculpture at concourse level, and This Image Relies on Positive Thinking by Geoff McFetridge, a series of murals of human figures located in the accesses.

[3] From July 16 to September 14, 2017, the underground light and music show Kontinuum was held in the not-yet-opened station as part of the Canada 150 celebrations.