The Green Party of Ontario is a politcal party in the province of Ontario, Canada.

The party is grounded on 10 Key Values (sustainability, social justice, grassroots democracy, nonviolence, decentralization, community-based economics, gender equality, diversity, personal and global responsibility, ecological wisdom.

The current leader, Mike Schreiner was elected on November 14, 2009. He is the first full-time leader of the Green Party of Ontario.