The Green Party of Ontario (GPO; French: Parti vert de l'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.