|Preceded by||Mike Cooper|
|Succeeded by||Riding abolished|
June 24, 1941|
Guelph, Ontario, Canada
|Died||December 2, 2013
Rideau Ferry, Ontario, Canada
|Political party||Progressive Conservative|
|Portfolio||Assistant Deputy Government Whip (1997-1999)|
Leadston was born in Guelph, Ontario. He was educated at Ontario Police College and Wilfrid Laurier University. He worked as a police constable in Kitchener, Ontario. He was also the founding member of the Big Brothers Association in Kitchener Waterloo in the 1970s and served as its President in 1975-1976.
Leadston served as a city councillor for Kitchener City Council from 1979 to 1994, and also served on the Regional Municipality of Waterloo from 1981 to 1994. In 1987, he was named as chair of the Waterloo Regional Police Commission.
Leadston was elected to the Ontario legislature in the 1995 provincial election, defeating Liberal candidate Shelley Schlueter and incumbent New Democratic Mike Cooper by a plurality of 7,000 votes. He served as a backbench supporter of the government of Mike Harris for the next four years.
In 1996, the Harris government reduced the number of ridings from 130 to 103. This meant that sitting MPPs had to compete for re-nomination in some ridings. Leadston ran for the Kitchener Centre PC nomination in 1999, but was defeated by Wayne Wettlaufer. In 2000, he sought the federal Canadian Alliance nomination in Lanark—Carleton, but lost to Scott Reid.
- Williamson, Robert (December 27, 1979). "Unity petition in electricity bills shocks Quebec". The Globe and Mail. p. P10.
- "Summary of Valid Ballots by Candidate". Elections Ontario. June 8, 1995. Retrieved 2 March 2014.[permanent dead link]
- Coyle, Jim (September 30, 1996). "Finding the best successor to Al McLean". Kingston Whig - Standard. p. 6.
- Urquhart, Ian (June 3, 1999). "Analysis: The key ridings to watch for clues to who's winning". Toronto Star. p. 1.
- "Harris team cool to Alliance Harris Tories playing it safe". Toronto Star. October 20, 2000. p. A1.
- Thompson, Catherine (December 4, 2013). "Guelph native and former area MPP Gary Leadston dies at 72".
- "Former MPP, city and regional councillor Gary Leadston dies at 72". The Kitchener Record. December 4, 2013. Retrieved May 3, 2014.