The George S. Lyon Shield was presented by the following golf clubs of the Toronto District for annual competition between teams of four men from each club, with the best aggregate gross score. In 1948, the 'George S. Lyon' was held, for the first time, under the auspices of the Ontario Golf Association. Before, this annual event had been operated by Mr. Phil Farley and Mr. Fred Lyon, Trustees. It was their wish that in future, the tournament should be handled by the OGA.
| Bathurst G&CC | Lakeview G&CC | Cedar Brook G&CC |
| Lambton G&CC | Glen Mawr G&CC | Mississaugua G&CC |
| Humber Valley GC | Rosedale GC | Islington GC |
| Rouge Hills G&CC | Lakeshore G&CC | Royal York G&CC |
| Scarboro G&CC | Summit G&CC | Toronto GC |
| Thornhill G&CC | Weston G&CC | York Downs G&CC |
| Upland GC |
| Year | Winning Club | Score |
|---|---|---|
| 1931 | Lambton Golf & Country Club | 335 |
| Fred G. Hoblitzell | ||
| J.H. Chipman | ||
| G.B. Heintzman | ||
| J.H. Firstbrook | ||
| 1931 | Royal York Golf & Country Club | 335 |
| William J. Thompson | ||
| D.W. Palmer | ||
| George S. Lyon | ||
| Hugh S. Reid | ||
| 1932 | Mississaugua Golf & Country Club | 311 |
| William J. Thompson | ||
| J.A. Cameron | ||
| W.A. Echardt | ||
| Frank Thompson | ||
| 1933 | The Toronto Golf Club | 315 |
| Lawrence W. Jackson | ||
| Clifford E. Beatty | ||
| W.G. More | ||
| Norman M. Scott | ||
| 1934 | Rosedale Golf Club | 316 |
| Donald D. Carrick | ||
| Roberts McLaren Gray | ||
| Rod Phelan | ||
| W.D.S. Morden | ||
| 1935 | York Downs Golf & Country Club | 316 |
| J.T. Eastwood | ||
| J. George Boeckh | ||
| James C. Boeckh | ||
| J.R. Robertson | ||
| 1936 | Mississaugua Golf & Country Club | 305 |
| W.A. Echardt | ||
| J.C. Williams | ||
| H. Millichamp | ||
| A.B. Stanley | ||
| 1937 | Summit Golf & Country Club | 313 |
| Mel Currer | ||
| John Holden | ||
| James Hopper | ||
| Gordon Taylor Jr. | ||
| 1938 | Weston Golf & Country Club | 310 |
| Alex Martin | ||
| A. Grimsditch | ||
| Ken Williams | ||
| J.P. Wright | ||
| 1939 | Summit Golf & Country Club | 323 |
| Mel Currer | ||
| John Holden | ||
| Gordon Taylor Jr. | ||
| George C. Hevenor | ||
| 1940 | Scarboro Golf & Country Club | 299 |
| Philip Farley | ||
| J.G. Adams | ||
| C.W. Levy | ||
| D.J. Donovan | ||
| 1941 | Scarboro Golf & Country Club | 306 |
| Philip Farley | ||
| J.G. Adams | ||
| C.W. Lloyd | ||
| D.J. Donovan | ||
| 1942 | Scarboro Golf & Country Club | 304 |
| M.A. Robinson | ||
| C.W. Lloyd | ||
| J.G. Adams | ||
| Philip Farley | ||
| 1943 | Royal York Golf & Country Club | 312 |
| A.G. Masterton | ||
| M. Wentworth | ||
| W. Broda | ||
| R.D. Young | ||
| 1944 | Scarboro Golf & Country Club | |
| Philip Farley | ||
| Robert Lee | ||
| J.J. McLaughlan | ||
| Russ Mayo | ||
| 1945 | Islington Golf Club | |
| A. Elmslie | ||
| W.E. Stead | ||
| N. Carter | ||
| G. Thomas | ||
| 1946 | Lakeview Golf Course | |
| A.M. Walton | ||
| George West | ||
| E.A Nerlich | ||
| H. Wallis | ||
| 1947 | Summit Golf & Country Club | |
| George C. Hevenor | ||
| G.M. Duncan | ||
| J. Chinery | ||
| J.R. Nixon | ||
| 1948 | Rockway Golf Club | 308 |
| Gerry Kesselring | ||
| Tony Matlock | ||
| Milt Plomske | ||
| J. McLeod | ||
| 1949 | Rockway Golf Club | 300 |
| Gerry Kesselring | ||
| Tony Matlock | ||
| Moe Norman | ||
| Milt Plomske | ||
| 1950 | Scarboro Golf & Country Club | 301 |
| Philip Farley | ||
| J.G. Adams | ||
| Bill Givens | ||
| Bob Fair | ||
| 1951 | Lambton Golf & Country Club | 302 |
| R.J. Amell | ||
| James C. Boeckh | ||
| Jerry Magee | ||
| J. George Boeckh | ||
| 1952 | Rockway Golf Club | 302 |
| W. Franklin | ||
| Milt Plomske | ||
| J. Knechtel | ||
| H. Hess | ||
| 1953 | Westmount Golf & Country Club | 299 |
| Gerry Kesselring | ||
| G. Ball | ||
| Grant Shirk | ||
| Don Heller | ||
| 1954 | Thornhill Country Club | 296 |
| R.E. Dale | ||
| T. Hogarth | ||
| E.A. Nerlich | ||
| J. Wagstaff | ||
| 1955 | Rockway Golf Club | 288 |
| Moe Norman | ||
| Tony Matlock | ||
| Gary Cowan | ||
| Milt Plomske | ||
| 1956 | Weston Golf & Country Club | 310 |
| Gordon Ball | ||
| Ernie Bently | ||
| Bruce Castator | ||
| Tom Woodall | ||
| 1957 | Scarboro Golf & Country Club | 296 |
| Eric Hanson | ||
| Doug McKellar | ||
| Philip Farley | ||
| Phil Brownlee | ||
| 1958 | St. Georges Golf & Country Club | 303 |
| Al Cassidy | ||
| Bud Masterton | ||
| William Miller | ||
| Hugh Paterson | ||
| 1959 | Lambton Golf & Country Club | 307 |
| Donald Gardner | ||
| Gordon M. MacKenzie | ||
| James C. Boeckh | ||
| J.R. Heimbecker | ||
| 1960 | London Hunt & Country Club | 298 |
| Colin Brown | ||
| M. Boulton | ||
| Emerson Creed | ||
| John B. Nash | ||
| 1961 | Lambton Golf & Country Club | 321 |
| Donald Gardner | ||
| J.R. Heimbecker | ||
| Gordon M. MacKenzie | ||
| J. Douglas Mossop | ||
| 1962 | Lambton Golf & Country Club | 313 |
| Gordon MacKenzie | ||
| J. Douglas Mossop | ||
| J.R. Heimbecker | ||
| James C. Boeckh | ||
| 1962 | Mississaugua Golf & Country Club | 313 |
| Nick Weslock | ||
| J. Fuller | ||
| D. Cooper | ||
| J. Guthrie | ||
| 1963 | Highland Country Club | 301 |
| Jim Currie | ||
| Don Hill | ||
| Peter Menzies | ||
| Derek Witchell | ||
| 1964 | Lambton Golf & Country Club | 301 |
| James C. Boeckh | ||
| J.R. Heimbecker | ||
| Gordon M. MacKenzie | ||
| J. Douglas Mossop | ||
| 1965 | Rockway Golf Club | 298 |
| Elmer Radtke | ||
| Bill Gross | ||
| Warren Rehkopf | ||
| Dick Riordan | ||
| 1966 | Weston Golf & Country Club | 285 |
| Doug Morgan | ||
| Ernie Bently | ||
| Tom Woodall | ||
| Doug Lauder | ||
| 1967 | Summit Golf & Country Club | 296 |
| Herb Carnegie | ||
| George Hevenor Jr. | ||
| Rick Luscombe | ||
| Peter Turner | ||
| 1968 | Mississaugua Golf & Country Club | 297 |
| Nick Weslock | ||
| Dave Cooper | ||
| Jack Littler | ||
| Ken Taylor | ||
| 1969 | Maple City Country Club | 308 |
| Rick Haynes | ||
| John Hanak | ||
| Ross Hunter | ||
| Lyn McFalls | ||
| 1970 | Pine Valley Golf Club | 307 |
| Grant Marshall | ||
| Ron Murray | ||
| Bob Harvey | ||
| Tom Woodall | ||
| 1971 | Brampton Golf Club | 304 |
| Bob Ptashnik | ||
| Ray Coole | ||
| George Schramm | ||
| Mike Pullen | ||
| 1972 | Sarnia Golf & Curling Club | 307 |
| Ross Dowswell | ||
| Bob Andrews | ||
| George Spencer | ||
| Pierre Choquette | ||
| 1973 | St. Georges Golf & Country Club | 306 |
| Nick Wright | ||
| John Swann | ||
| Al Cassidy | ||
| Wayne Kimura | ||
| 1974 | Sunningdale Golf & Country Club | 301 |
| Doug Galloway | ||
| Glenn Johnston | ||
| Kelly Roberts | ||
| Don White | ||
| 1975 | Scarboro Golf & Country Club | 299 |
| George Bannister | ||
| Jack Brown | ||
| Chris Bundy | ||
| Ron Green | ||
| 1976 | No Competition Due to Weather | |
| 1977 | Whirlpool Golf Club | 307 |
| Les Westlake | ||
| Mike Lococo | ||
| Wayne Wiese | ||
| Mike Swec Jr. | ||
| 1978 | Whitevale Golf Club | 304 |
| Bruce Brewer | ||
| Paul Davis | ||
| Bob Kennedy | ||
| Bob Nebel | ||
| 1979 | Scarboro Golf & Country Club | 297 |
| Ron Green | ||
| Larry Longo | ||
| George Bannister | ||
| Bob Penney | ||
| 1980 | Whitevale Golf Club | 294 |
| Paul Davis | ||
| Bruce Brewer | ||
| Hank Nijhuis | ||
| Jack Lilley | ||
| 1981 | Weston Golf & Country Club | 288 |
| Glen Sye | ||
| Warren Sye | ||
| Ernie Bently | ||
| Paul Wildbridge | ||
| 1982 | Whitevale Golf Club | 290 |
| Mark Brewer | ||
| Ray Brammer | ||
| Bruce Brewer | ||
| Paul Davis | ||
| 1983 | Weston Golf & Country Club | 299 |
| Robert Harvey | ||
| Warren Sye | ||
| Glen Sye | ||
| Grant Marshall | ||
| 1984 | Sunningdale Golf & Country Club | 297 |
| Kelly Roberts | ||
| Doug Walker | ||
| Len Foran | ||
| Murray Clarke | ||
| 1985 | Sunningdale Golf & Country Club | 299 |
| Kelly Roberts | ||
| Doug Walker | ||
| Len Foran | ||
| Murray Clarke | ||
| 1986 | Summit Golf & Country Club | 295 |
| David Laws | ||
| Anthony Robinson | ||
| William Sheldon | ||
| Brian Matheson | ||
| 1987 | Cutten Club | 295 |
| Andy Smart | ||
| John Pate | ||
| Rick Ludlow | ||
| Mark Sloopka | ||
| 1988 | Summit Golf & Country Club | 303 |
| Doug Walker | ||
| Dave Laws | ||
| Bill Gibson | ||
| Bill Shields | ||
| 1989 | Sarnia Golf & Curling Club | 296 |
| Bill Doohan | ||
| Jace Kohlmeier | ||
| Dan Clark | ||
| John Thrasher | ||
| 1990 | Bayview Country Club | 299 |
| John Silvester | ||
| Mike Mealia | ||
| Jack Velanoff | ||
| John Mealia | ||
| 1991 | Weston Golf & Country Club | |
| Warren Sye | ||
| Mark Wadey | ||
| Tony Cope | ||
| Gabe Rapini | ||
| 1992 | Sarnia Golf & Curling Club | 227 |
| Bill Hutcheson | ||
| Todd Doohan | ||
| Dan Houlihan | ||
| 1993 | Sunningdale Golf & Country Club | 223 |
| Steve Whelan | ||
| Kelly Roberts | ||
| Brian Holmes | ||
| 1994 | Sarnia Golf & Curling Club | 299 |
| Bob Andrews | ||
| Paul Kowalshyn | ||
| Dan Houlihan | ||
| Guy Kohlmeir | ||
| 1995 | Cedar Brae Golf & Country Club | 302 |
| Mark Westfall | ||
| Bill Howie | ||
| Steve Wagner | ||
| Gordon Burns | ||
| 1996 | Brantford Golf & Country Club | 299 |
| David Hearn | ||
| Michael Hospodar | ||
| Craig Patterson | ||
| Peter Falle | ||
| 1997 | Scarboro Golf & Country Club | 291 |
| Jesse Collinson | ||
| Rick Grundy | ||
| Paul Davis | ||
| Don Davis | ||
| 1998 | Trafalgar Golf & Country Club | 296 |
| Tom Schupp | ||
| Peter Laws | ||
| Jeremy Oxley | ||
| Stephen Raitt | ||
| 1999 | The Oaks Golf & Country Club | 300 |
| Kelly Roberts | ||
| Ryan McColl | ||
| Joseph Vandervelden | ||
| John Herbert | ||
| 2000 | The Cutten Club | 300 |
| Brandon Kleinknecht | ||
| Peter Buzanis | ||
| Frank Morris | ||
| Bob Desautels | ||
| 2006 | Cedar Brae G&CC | 295 |
| Richard Ross | ||
| Mark Westfal | ||
| Bob Gibson | ||
| Ken Bremner | ||
| 2007 | The National GC of Canada | 291 |
| Bill Hutcheson | ||
| Ernie Vettese | ||
| Dan Partland | ||
| Darren McNair | ||
| 2008 | Hamilton G&CC | 291 |
| Matthew Ion Young | ||
| Matthew Jacobs | ||
| Stephen Dimen | ||
| Scott Niewland | ||
| 2009 | Hamilton G&CC | 289 |
| Christopher Ross | ||
| Matthew Ion Young | ||
| Boyd Mickle | ||
| Stephen Dimen | ||
| 2010 | Mississaugua | 298 |
| Larry Cooper | ||
| Matthew Sim | ||
| Mike Schramm | ||
| Alex MacDonald | ||
| 2011 | Mississaugua | 307 |
| Rob Weir | ||
| Mike Schramm | ||
| Alex MacDonald | ||
| Blake McLennan | ||
| 2012 | Whitevale | 300 |
| Mark Brewer | ||
| Barry Fairhurst | ||
| Cam Hreljac | ||
| Chris O'Brien | ||
| 2013 | Whitevale | 318 |
| Delcan Dunn | ||
| Dave Walker | ||
| Barry Fairhurst | ||
| Robert Nebel | ||
| 2014 | Cedar Brae | 304 |
| Robert Gibson | ||
| Richard Persaud | ||
| Wesley Kwok | ||
| Marc St-Germain | ||
| 2015 | Championship not contested | |
| 2016 | Sarnia Golf & Curling Club | 306 |
| Heath McCormick | ||
| Eric Pattenaude | ||
| Ethan O'Meara | ||
| Brian Reinholt | ||
| 2017 | Brampton Golf Club | 309 |
| Sean Lackey | ||
| Simon Reyers | ||
| Dave Bunker | ||
| Gary Parker | ||
| 2018 | Cataraqui Golf & Country Club | 291 |
| Peter Sauerbrei | ||
| Noah Steele | ||
| Drew Mayhew | ||
| Jamaal Moussaoui |
