Environmental Defence is a Canadian environmental organization, founded in 1984. Its areas of education and research include toxic chemicals, urban sprawl, oil sands, global warming, water quality, and endangered species.

Environmental Defence was part of the founding of the Green Energy Act Alliance. The Green Energy and Economy Act, a first for North America, went into law in Ontario in 2009, and outlined a strategy to improve conservation, increase renewable energy generation, and create green jobs. The Act formed part of the Ontario government’s plan to put the province on a path towards reducing its greenhouse gas emissions, while becoming a leader in the emerging global renewable energy sector.