This is a list of the mayors of the City of Ottawa, Ontario, Canada. Until 1854, Ottawa was known as Bytown. Over the course of Ottawa's history, the borders of the community have greatly expanded. This most recently occurred in 2001 when a number of neighbouring communities were amalgamated with Ottawa.

Mayors of the "new" City of Ottawa

• 2001- present - Bob Chiarelli

Former Municipalities

Regional Municipality of Ottawa-Carleton (chairs)

•  ?? - 1998 Peter C. Clark
• 1998 - 2001 Bob Chiarelli

Bytown

• 1847 - John Scott
• 1848 - John Bower Lewis]
• 1849 - Robert Hervey]
• 1850 - John Scott
• 1851 - Charles Sparrow
• 1852 - R.W. Scott
• 1853 - J.B. Turgeon
• 1854 - Henry J. Friel

City of Ottawa (to 2000)

• 1855-1857 - John Bower Lewis
• 1858-1859 - Edward McGillivray
• 1860-1862 - Alexander Workman]
• 1863 - Henry J. Friel
• 1864-1866 - M.K. Dickinson
• 1867 - Robert Lyon
• 1868-1869 - Henry J. Friel
• 1870-1871 - John Rochester
• 1872-1873 - E. Martineau
• 1874-1875 - J.P. Featherston
• 1876 - G.B.L Fellows
• 1877 - W.H. Waller
• 1878 - C.W. Bangs
• 1879-1881 - Charles H. Mackintosh
• 1882-1883 - Pierre St. Jean, M.D.
• 1884 - C.T. Bate
• 1885-1886 - Francis McDougal
• 1887-1888 - McLeod Stewart
• 1889-1890 - Jacob Erratt
• 1891 - Thomas Birkett
• 1892-1893 - Olivier Durocher
• 1894 - George Cox
• 1985-1896 - William Borthwick
• 1897-1898 - Samuel Bingham
• 1899-1900 - Thomas Payment
• 1901 - W.D. Morris
• 1901 - James Davidson
• 1902-1903 - Fred Cook
• 1904-1906 - James A. Ellis
• 1906 - Robert A. Hastey
• 1907-1908 - D'Arcy Scott
• 1908 - Napoleon Champagne
• 1909-1912 - Charles Hopewell
• 1912 - Edward H. Hinchey
• 1913 - James A. Ellis
• 1914 - Taylor McVeity
• 1915-1916 - Nelson D. Porter
• 1917-1920 - Harold Fisher
• 1921-1923 - Frank H. Plant
• 1924 - Napoleon Champagne
• 1924 - Henry Watters
• 1935-1927 - John P. Balharrie
• 1928-1929 - Arthur Ellis
• 1930 - Frank H. Plant
• 1931-1933 - John J. Allen
• 1934-1935 - Patrick Nolan
• 1936-1948 - J.E.S. Lewis
• 1949-1950 - E.A. Bourque
• 1951 - Grenville Goodwin
• 1951-1956 - Charlotte Whitton
• 1957-1960 - George H. Nelms]]
• 1961-1964 - Charlotte Whitton
• 1965-1969 - Donald B. Reid
• 1970-1972 - Kenneth H. Fogarty, Q.C.
• 1972-1974 - Pierre Benoit
• 1975-1978 - Lorry Greenberg
• 1978-1985 - Marion Dewar
• 1985-1991 - James A. Durrell
• 1991 - Marc Laviolette
• 1991-1997 - Jacquelin Holzman
• 1997-2000 - Jim Watson

Cumberland

Gloucester

Goulbourn Township

Kanata

Nepean

Osgoode Township

•  ?? - 1995 - Al Bowers
• 1995 - 1998 - Lloyd Chranston
• 1998 - 2001 - Doug Thompson

Rideau Township

Rockcliffe Park

Vanier

West Carleton

See also List of Ottawa municipal elections