The flag of Ottawa is blue on the left and green on the right with a stylized white "O" design in the middle. It was adopted following the amalgamation of municipalities in the Regional Municipality of Ottawa–Carleton into Ottawa in 2001.<gallery>
File:Flag of Ottawa (1902–1987).svg|Flag of Ottawa, 1902–1987
File:Flag of Ottawa, Ontario (1987–2000).svg|Flag of Ottawa, 1987–2000
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The current flag
The municipalities of the Regional Municipality of Ottawa–Carleton were merged into Ottawa in 2001, and a new flag was developed in the process.
The governing body in charge was Visual Identity Advisory Committee of the Ottawa Transition Board, which worked with the Canadian Heraldic Authority. The public was consulted during the development process, while a commercial design firm created the concept. The firm also developed a coat of arms which was not adopted, and instead the coat of arms was retained from the pre-merger city of Ottawa. The Ottawa Transition Board approved the new flag on 23 October 2000, and the City Council of Ottawa formally adopted the flag on 24 January 2001, on which date the flag was officially flown for the first time.