This is a list of reeves and mayors of St. Thomas, Ontario, Canada. St. Thomas was incorporated as a village in 1852, as a town in 1861, and as a city in 1881.

Village reeves 1852–1855 — David Parish 1856–1856 — Edward Ermatinger 1857–1857 — Asa Howard 1858–1858 — Thomas Arkell 1859–1859 — Archibald McIntyre 1860–1860 — Dr. George Southwick

Town reeve 1861–1861 — Archilbald McInytre

Town mayors 1861–1861 — M.T.Moore 1862–1864 — Dr. George Southwick 1865–1871 — Thomas Arkell 1872–1872 — Archibald McLachlin 1873–1876 — Daniel Drake 1877–1878 — Dr. D. McLarty 1879–1880 — John E Smith

City mayors 1881–1900 1881–1882 — Dr. William C. VanBuskirk 1883–1883 — Dr. Eliphalet Wilbur Gustin 1884–1885 — Edward Horton 1886–1886 — John E. Smith 1887–1888 — John Midgley 1889–1890 — Israel Morse 1891–1892 — Robert McCully 1893–1894 — George L. Oill 1895–1896 — William E. Idsardi 1897–1898 — Frederick W. Wright 1899–1900 — Patrick Meehan

1901–1950 1901–1902 — Sperrin Chant 1903–1904 — Charles Francis Maxwell 1905–1905 — Thomas Meek 1906–1907 — Calvin Lawrence 1908–1909 — George Geddes 1910–1911 — Dr. Frederick Guest 1912–1913 — Robert N. Price 1914–1915 — Marshall B. Johnson 1916–1917 — William Trott 1918–1919 — Edward A. Horton 1920–1921 — Frank L. Brinkman 1922–1923 — Charles E. Raven 1924–1925 — George H. Sloggett 1926–1927 — John Handford 1928–1929 — William Stokes 1930–1933 — John A. Jagoe 1934–1935 — Angus W. Johnson 1936–1938 — Ernest Duckworth 1939–1940 — Peter Laing, Jr. 1941–1943 — George T. Dyer 1944–1945 — Thomas H. Currah 1946–1946 — Richard A. Sanders 1947–1949 — J. Bruce Caldwell 1950–1950 — Major John F. Peterson

1951–present 1951–1951 — Dr. E. Cecil Gliddon 1952–1954 — Thomas H. Currah 1955–1956 — Peter Laing 1957–1958 — John M. Stirling 1959–1964 — Vincent A. Barrie 1965–1966 — Donald R. Stokes 1967–1968 — Vincent A. Barrie 1969–1971 — Edward O. Fanjoy 1972–1974 — Eber J. Rice 1975–1976 — M. Wayne Neal 1977–1978 — Cliff Barwick 1978–1980 — Don Hitch 1980–1985 — Doug Tarry 1985–1991 — Janet Golding 1991–1999 — Stephen J. Peters 1999–2000 — Joanne Brooks 2000–2003 — Peter Ostojic 2003–2006 — Jeff Kohler 2006–2010 — Cliff Barwick 2010-2018 — Heather Jackson 2018-present — Joe Preston

References Talbot Times, Vol. II, Issue 4, December 1983 — Newsletter of the Elgin County branch of the Ontario Genealogical Society List of leaders in St. Thomas