Frank de Jong (born October 16, 1955) is a Canadian politician, environmentalist, and elementary school teacher.

He developed an interest in environmental concerns during the mid-1980s, and became involved in campaigns to save Ontario's old growth forests.

There is a direct line between these changes to our constitution and the eventual election of Mike Schreiner to the provincial legislature.

De Jong himself entered this contest, and defeated Jim Harris, who later became leader of the Green Party of Canada.

At the 2007 AGM, de Jong survived the next scheduled review, this time with approximately 71% support from party members.

[5] In that election, de Jong captured 10.26 percent of the vote, his best showing as a member of the Green Party.

His best showing was in the provincial election of 2003, when he ran against sitting Premier Ernie Eves and finished third, ahead of the New Democratic Party candidate.

During the 1995 provincial campaign, de Jong cycled on a "leader's tour" from Ottawa to Sault Ste.