The following individuals have held the position of treasurer of the Law Society of Upper Canada (1797–2018) or the Law Society of Ontario (2018–present).^[1]

• John White 1797–1798
• Robert Isaac Dey Gray 1798–1801
• Angus Macdonell 1801–1805
• Thomas Scott 1805–1806
• G. D'Arcy Boulton 1806–1811
• William Warren Baldwin 1811–1815
• G. D'Arcy Boulton 1815–1818
• Sir John Robinson, 1st Baronet, of Toronto 1818–1819
• Henry John Boulton 1819–1820
• William Warren Baldwin 1820–1821
• Sir John Robinson, 1st Baronet, of Toronto 1821–1822
• Henry John Boulton 1822–1824
• William Warren Baldwin 1824–1828
• Sir John Robinson, 1st Baronet, of Toronto 1828–1829
• George Ridout 1829–1832
• William Warren Baldwin 1832–1836
• Robert Baldwin Sullivan 1836
• Robert Sympson Jameson 1836–1841
• Levius Peters Sherwood 1841–1843
• William Henry Draper 1843–1845
• Robert Sympson Jameson 1845–1846
• Henry John Boulton 1846–1847
• Robert Baldwin 1847–1848
• James Edward Small 1848–1849
• Robert Easton Burns 1849–1850
• John Godfrey Spragge 1850
• Robert Baldwin 1850–1859
• James Buchanan MacAulay 1859
• John Hillyard Cameron 1859–1876
• Stephen Richards 1876–1879
• Edward Blake 1879–1893
• Aemilius Irving 1893–1913
• George Ferguson Shepley 1913–1916
• John Hoskin 1916–1921
• Featherston Osler 1921–1924
• Frederick Weir Harcourt 1924–1927
• Wallace Nesbitt 1927–1930
• William Norman Tilley 1930–1935
• Newton Rowell 1935–1936
• Michael Herman Ludwig 1936–1937
• Robert Spelman Robertson 1937–1939
• D'Alton Lally McCarthy 1939–1944
• John Shirley Denison 1944–1947
• Gershom William Mason 1947–1950
• Cyril Frederick Harshaw Carson 1950–1958
• John Josiah Robinette 1958–1962
• Joseph Sedgwick 1962–1963
• John Douglas Arnup 1963–1966
• Brendan O'Brien 1966–1968
• William Goldwin Carrington Howland 1968–1970
• Goldwin Arthur Martin 1970–1971
• Sydney Lewis Robins 1971–1974
• Stuart Douglas Thom 1974–1976
• Wesley Gibson Gray 1976–1978
• George Duncan Finlayson 1978–1980
• John Douglas Bowlby 1980–1983
• Brendan O'Brien 1983
• Laura Legge 1983–1985
• Pierre Genest 1985–1986
• Arthur Richard Andrew Scace 1986–1987
• William Daniel Chilcott 1987–1988
• Laura Legge 1988
• Lee Kenneth Ferrier 1988–1990
• James MacDonald Spence 1990–1992
• Allan Michael Rock 1992–1993
• Paul Stephen Andrew Lamek 1993–1995
• Eleanor Susan Elliott 1995–1997
• Harvey Thomas Strosberg 1997–1999
• Robert Patrick Armstrong 1999–2001
• Vern Krishna 2001–2003
• Frank Neal Stephen Marrocco 2003–2005
• George Douglas Hunter 2005–2006
• Clayton Ruby (interim treasurer) 2006
• Gavin MacKenzie 2006–2008
• Derry Millar 2008–2010
• Laurie Pawlitza 2010–2012
• Thomas G. Conway 2012–2014
• Janet E. Minor 2014–2016
• Paul Schabas 2016–2018

• Malcolm M. Mercer 2018–2020^[2]
• Teresa Donnelly 2020–22
• Jacqueline Horvat 2022–present