| class="wikitable sortable" style="text-align:center;"
! colspan=2 width="115" | Mayor
! width="115" | Term began
! width="115" | Term ended
! width="20" | Ref |
| 1
|William Bradley Marshall
|1899
|1900
|["Town Council". Calgary Herald, November 26, 1898.] |
| 2
|William Finlay
|1900
|1903
|[{{cite book |editor1-last=Chambers |editor1-first=Ernest J. |editor1-link=Ernest J. Chambers |title=The Canadian Parliamentary Guide |date=1909 |publisher=Mortimer Company Ltd. |location=Ottawa |url=https://archive.org/details/canadianparliame1909unse |accessdate=August 9, 2020 |issn=0315-6168 |oclc=266967058 |page=437|isbn=9781414401416 }}] |
| 3
|Archibald Hawthorne
|1903
|1904
| |
| 4
|Thomas Hutchinson
|1904
|1905
|["Gas At Medicine Hat". Calgary Herald, June 20, 1904.] |
| 5
|Fred Forster
|1905
|1907
| |
| 6
|William Cousins
|1907
|1909
|["The Provincial Nominations". Calgary Herald, December 3, 1907.] |
| 7
|David Milne
|1909
|1912
|["Medicine Hat Nominations". Calgary Herald, December 9, 1908.] |
| 8
|Nelson Spencer
|1912
|1914
|["Municipal candidates nominated yesterday in many Western towns". Calgary Herald, December 5, 1911.] |
| 9
|Mervyn Brown
|1914
|1915
|["School Trustees Are To Hold Convention". Edmonton Journal, January 21, 1914.] |
| (3)
|Archibald Hawthorne
|1915
|1917
|["Election Returns Throughout West". Edmonton Bulletin, December 15, 1914.] |
| 10
|S. Cruikshank
|1917
|1918
|["Women prodding Hat aldermen to take action". Calgary Herald, April 24, 1917.] |
| (9)
|Mervyn Brown
|1918
|1921
|[Sally Sehn, [https://medicinehatnews.com/life/local-life/2020/01/11/heritage-in-the-hat-browns-honour/ "Heritage in the Hat: Brown’s honour"]. Medicine Hat News, January 11, 2020.] |
| 11
|Walter Huckvale
|1921
|1926
|["Walter Huckvale Is Medicine Hat Mayor". Calgary Herald, December 14, 1921.] |
| 12
|Isaac Bullivant
|1926
|1939
|["Leading Citizen: Mayor Isaac Bullivant". Calgary Herald, May 7, 1928.] |
| 13
|Hector Lang
|1939
|1947
|["Two Cities Elect Mayors". Calgary Herald, December 13, 1938.] |
| 14
|W. M. (Mac) Rae
|1947
|1949
|["Committees of Council Named". Lethbridge Herald, January 7, 1947.] |
| (13)
|Hector Lang
|1949
|1950
|["Medicine Hat Voters Elect Four Aldermen". Calgary Herald, December 13, 1949.] |
| 15
|Wilson Riley
|1950
|1952
|["Wilson Riley Elected Mayor of Medicine Hat". Calgary Herald, December 12, 1950.] |
| 16
|Harry Veiner
|1952
|1966
|[Eddie Olynuk, [https://archive.macleans.ca/article/1959/8/15/backstage "Backstage: Is The Hat's Veiner world champ?"]. Maclean's, August 15, 1959.] |
| 17
|Chuck Meagher
|1966
|1968
|["Pharmacist in Medicine Hat ends Veiner's 14-year reign". Calgary Herald, October 20, 1966.] |
| (16)
|Harry Veiner
|1968
|1974
|["Veiner returns as mayor". Edmonton Journal, October 17, 1968.] |
| 18
|Ted Grimm
|1974
|1977
|["Budget may hurt colleges". Red Deer Advocate, November 19, 1976.] |
| 19
|Milt Reinhardt
|1977
|1980
|[|Nuclear fuel recovery plant planned for Medicine Hat". Edmonton Journal, November 24, 1977.] |
| (18)
|Ted Grimm
|1980
|2001
|[Jeff Sallot, "Tax inflames gas-brimmed Medicine Hat". The Globe and Mail, January 21, 1981.] |
| 20
|Garth Vallely
|2001
|2007
|[John Cotter, "Alberta elects new city councils". Peace River Block News, October 16, 2001.] |
| 21
|Norm Boucher
|2007
|2013
|[Geoffrey Scotton, "Former police chief new Medicine Hat mayor". Calgary Herald, October 16, 2007.] |
| 22
|Ted Clugston
|2013
|2021
|["Nenshi re-elected as Calgary mayor, Iveson chosen by Edmonton voters". Canadian Press, October 22, 2013.] |
| 23
|Linnsie Clark
|2021
|2024[In March 2024, Clark was stripped of her mayoral powers under the Municipal Government Act, for violating the city's code of conduct by not treating the city manager with dignity and respect during a 2023 council meeting. The next municipal election is not until 2025, hence she will maintain her position but with reduced pay and restrictions on her ability to interact with the city administration.]
|[Melissa Gilligan, [https://calgary.ctvnews.ca/medicine-hat-elects-first-female-mayor-5-female-councillors-1.5629330 "Medicine Hat elects first female mayor, 5 female councillors"]. CTV News Calgary, October 19, 2021.][{{Cite web |date=2024-03-21 |title=Medicine Hat, Alta., mayor stripped of powers, pay following August incident at council |url=https://calgary.ctvnews.ca/medicine-hat-alta-mayor-stripped-of-powers-pay-following-august-incident-at-council-1.6817155 |access-date=2024-05-07 |website=CTV News Calgary |language=en}}] |