The Green Party of Ontario is a political party in Ontario, Canada. The party is led by Mike Schreiner. In 2018, Schreiner was elected as the party's first member of the Ontario Legislative Assembly. In the past, the party did see significant gains in the 2007 provincial election, earning 8% of the popular vote with some candidates placing second and third in their ridings. A milestone was reached in the 2018 provincial election, when Schreiner was elected to the Legislative Assembly of Ontario in the riding of Guelph.

Mike Schreiner is a Canadian politician who has served as the leader of the Green Party of Ontario since 2009. Schreiner sits as a member of Provincial Parliament (MPP), representing Guelph; his 2018 election made him the first Green Party member elected to the Legislative Assembly of Ontario.