Past Presidents
- 1936, 1937 & 1938 - A.T. Whittaker*, Brantford
- 1939 & 1940 - F. Marshall*, Hamilton
- Unavailable - W.E. Foster, Welland
- Unavailable - G. Allen*, London
- Unavailable - P. Hill*, Galt
Note: Records are not available for the above. However, these persons are known to have been president during this time.
OPA Past Presidents Presidents Since Re-Organization
- 1953 - Ellroy Lippert*, Kitchener
- 1954 & 1955 - J.T. Bennett*, Guelph
- 1956 - William H. Taylor*, Kitchener
- 1957 - William H. Browne, Waterloo
- 1958 & 1959 - Andrew H. Macdonald*, Etobicoke
- 1960 & 1961 - William H. Palmer*, Sarnia
- 1962 & 1963 - William G. MacDonald*, Forest Hill
- 1964 - Robert A.J. Munson, St. Catharines
- 1965 - Robert F. Harrison, North York
- 1966 - Ernie R. Seager*, Hamilton
- 1967 - F. Len Joylyn, Jr.*, Brantford
- 1968 - Harry J. Christian*, Toronto
- 1969 - S. Beggs*, Richmond Hill
- 1970 - D. William Loker*, Downsview
- 1971 - Ken H. Pflug*, Waterloo
- 1972 - Harold A. Brain, Sault Ste Marie
- 1973 - Dan Costea, Windsor
- 1974 - C. Porter, Peterborough
- 1975 - Russ C. Nutley*, Hamilton (Part Term)
- 1975 & 1976 - Tom F. Clancy, Kitchener
- 1977 - L.A. Wright, Sarnia
- 1978 - Ronald Stannard*, Peterborough
- 1979 - Hans Loewig, Brantford
- 1980 - Dennis Manning*, Scarborough
- 1981 - Elsa Bethal-Haydon, Goderich
- 1982 - Jay C. Kivell, Guelph
- 1983 - John Budd*, Scarborough
- 1984 - Norm Duncan, Cobourg
- 1985 - R. Allen, Peterborough
- 1986 - Edward W. Martin, Stratford
- 1987 - Jamie A. Houston, North Bay
- 1988 - Fred Salvador*, Timmins
- 1989 - Vic Hergott, Cambridge
- 1990 - Allan Seabrooke, Aurora
- 1991 - Donna Harrison, St. Catharines
- 1992 - C. Frank Lattanzio, St. Thomas
- 1993 - J. Hood, Elliot Lake
- 1994 - John Lohuis, London
- 1995 - William Hett, Markham
- 1996 - Brian Detzler, Waterloo
- 1997 - Andy Wickens, Downsview
- 1998 - John Hannah, Cambridge
- 1999 - Lynda Rotteau, Goderich
- 2000 - Mark Hillis, Waterloo
- 2001 - Don Sadler, Windsor
- 2002 & 2003 - Paul Ronan, Toronto
- 2004 & 2005 - Bruce Hay, Brampton
- 2006 - Leo Ostner, Oakville
- 2007 - Maureen Sinclair, Brantford
- 2008 & 2009 - Bill Slute, Oshawa
- 2010 & 2011 - Bill Harding, Toronto
* Denotes Deceased