Catherine Mary McKenna is a Canadian lawyer and former politician who served as a Cabinet minister from 2015 to 2021. A member of the Liberal Party, McKenna was the minister of environment and climate change from 2015 to 2019 and minister of infrastructure and communities from 2019 to 2021. She was the member of Parliament (MP) for Ottawa Centre from 2015 to 2021, but decided not to seek reelection in the 2021 federal election.

The minister of environment and climate change is a minister of the Crown in the Cabinet of Canada. The portfolio is responsible for the Environment and Climate Change Canada, as well as a number of other federal organizations including Parks Canada, and the Impact Assessment Agency of Canada.