List of mayors of Ottawa

• 1847 – John Scott
• 1848 – John Bower Lewis
• 1849 – Robert Hervey
• 1850 – John Scott
• 1851 – Charles Sparrow
• 1852 – Richard William Scott
• 1853 – Joseph-Balsora Turgeon
• 1854 – Henry J. Friel

• 1855–1857 – John Bower Lewis
• 1858–1859 – Edward McGillivray
• 1860–1862 – Alexander Workman
• 1863 – ? – Henry J. Friel
• 1864–1866 – Moss Kent Dickinson
• 1867 – Robert Lyon
• 1868–1869 – Henry J. Friel
• 1870–1871 – John Rochester
• 1872–1873 – Eugène Martineau
• 1874–1875 – John Peter Featherston
• 1876 – G. B. Lyon-Fellowes
• 1877 – William Henry Waller
• 1878 – Chauncey Ward Bangs
• 1879–1881 – Charles Herbert Mackintosh
• 1882–1883 – Pierre St. Jean, M.D.
• 1884 – Charles Thornton Bate
• 1885–1886 – Francis McDougal
• 1887–1888 – McLeod Stewart
• 1889–1890 – Jacob Erratt
• 1891 – Thomas Birkett
• 1892–1893 – Olivier Durocher
• 1894 – George Cox
• 1895–1896 – William Borthwick
• 1897–1898 – Samuel Bingham
• 1899–1900 – Thomas Payment
• 1901 – William Dowler Morris
• 1901 – James Davidson
• 1902–1903 – Fred Cook
• 1904–1906 – James A. Ellis
• 1906 – Robert A. Hastey
• 1907–1908 – D'Arcy Scott
• 1908 – Napoléon 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 – Henry Watters
• 1924 – Napoléon Champagne
• 1925–1927 – John P. Balharrie
• 1928–1929 – Arthur Ellis
• 1930 – Frank H. Plant
• 1931–1933 – John J. Allen
• 1934–1935 – Patrick Nolan
• 1936–1948 – J.E. Stanley 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 Bartlett 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
• 2000–2001 – Allan Higdon

When the city of Ottawa amalgamated in 2001, these were the mayors of the municipalities that amalgamated:

• Chair of the Regional Municipality of Ottawa-Carleton: Bob Chiarelli
• Ottawa: Allan Higdon (acting)
• Gloucester: Claudette Cain
• Kanata: Merle Nicholds
• Nepean: Mary Pitt
• Vanier: Guy Cousineau
• Cumberland: Gerry Lalonde (acting)
• Goulbourn: Janet Stavinga
• Osgoode: Doug Thompson
• Rideau: Glenn Brooks
• West Carleton: Dwight Eastman
• Rockcliffe Park: Patrick J. Murray

• Bob Chiarelli, 2001–2006
• Larry O'Brien, 2006–2010[3]
• Michel Bellemare, 2 May – 8 July 2009 (acting)
• Doug Thompson, 8 July – 6 August 2009 (acting)
• Jim Watson, 2010–2022
• Mark Sutcliffe, 2022

Note: Bellemare and Thompson served as acting mayor during O'Brien's leave of absence, due to criminal charges before the court.

• List of Ottawa municipal elections
• Mayors of Osgoode Township