The Senate of Canada Building is a government building and former railway station that serves as the temporary seat of the Senate of Canada. Located at 2 Rideau Street in downtown Ottawa, it was known as Ottawa Union Station and served as the city's central railway station from 1912 until 1966. From 1966 to 2018, it was operated by the Government of Canada as the Government Conference Centre. The building currently includes a temporary Senate chamber, as well as some Senate offices and committee rooms.

The Senate of Canada is the upper house of the Parliament of Canada. Together with the Crown and the House of Commons, they compose the bicameral legislature of Canada.