Theresa McClenaghan (1962-) is a Canadian lawyer. She has pursued public interest environmental law throughout her career, representing individuals, groups, and First Nations in environmental matters of local, regional, and national significance. McClenaghan obtained her LLB from the University of Western Ontario, an LLM from Osgood Hall Law School, York University, and a diploma in Environmental Health from McMaster University. She has been called to the bar of Manitoba and Ontario, and has practiced law in Kitchener, Paris, and Toronto, Ontario.