Rideau is a station on the O-Train Confederation Line on Rideau Street on the border of the Sandy Hill and ByWard Market neighbourhoods in Central Ottawa, Ontario, Canada.

The O-Train is a light rail rapid transit system in Ottawa, Ontario, Canada, operated by OC Transpo. The O-Train system has two lines, the electrically-operated Confederation Line and the diesel-operated Trillium Line. Since May 2020, Stage 2 construction has temporarily shut down Line 2, with replacement bus service being offered at all stations. When Line 2 reopens in 2024, it will extend southward to Limebank station and incorporate five newly constructed stations, as well as an additional line linking Line 2 to Ottawa International Airport which will replace the current bus service from route 97. By 2026, expansions along Line 1 and the construction of Line 3 stations in the west end are expected to be complete, bringing the system's length to 64.5 km (40.1 mi), four lines and 41 stations. The O-Train network is fully grade separated and does not have any level crossings with roads.