The following is a list of mayors of Ottawa. Until 1854, Ottawa was known as Bytown. Over the course of Ottawa's history, the borders of the municipality have greatly expanded through annexations. This most recently occurred in 2001 when a number of neighbouring communities were amalgamated with Ottawa.
When the city of Ottawa amalgamated in 2001, these were the mayors of the municipalities that amalgamated:
| No. | Mayor | In office | Notes | ||
|---|---|---|---|---|---|
| 57 | Bob Chiarelli | January 1, 2001 | December 1, 2006 | ||
| 58 | Larry O'Brien | December 1, 2006 | November 30, 2010 | ||
| — | Michel Bellemare (acting) | May 2, 2009 | July 8, 2009 | ||
| — | Doug Thompson (acting) | July 8, 2009 | August 6, 2009 | ||
| 56 |  | Jim Watson | December 1, 2010 | November 15, 2022 | |
| 59 |  | Mark Sutcliffe | November 15, 2022 | Incumbent | |
Note: Bellemare and Thompson served as acting mayor during O'Brien's leave of absence, due to criminal charges before the court.
| Bytown (1847–55) | |
|---|---|
| Ottawa (1855–2001) |
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| Ottawa (2001 amalgamation – present) | |
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The Ottawa City Council is the governing body of the City of Ottawa, Ontario, Canada. It is composed of 24 city councillors and the mayor. The mayor is elected at large, while each councillor represents wards throughout the city. Council members are elected to four-year terms, with the last election being on October 24, 2022. The council meets at Ottawa City Hall in downtown Ottawa. Much of the council's work is done in the standing committees made up of sub-groups of councillors. The decisions made in these committees are presented to the full council and voted upon.
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