The Oklahoma Secretary of Environment is a member of the Oklahoma Governor's Cabinet. The Secretary is appointed by the Governor, with the consent of the Oklahoma Senate, to serve at the pleasure of the Governor. The Secretary serves as the chief advisor to the Governor on environmental policy development and implementation.

The last Secretary was Gary Sherrer, who was appointed by Governor Mary Fallin on January 14, 2011.

The current Secretary of the successor office, the Office of the Secretary of Energy and Environment, is Michael Teague.

The Office of the Secretary of Environment was established in 1993 to provide greater oversight to the environmental activities of the State government. The Office was established, along with the Oklahoma Department of Environmental Quality, by the Oklahoma Environmental Quality Act of 1993. The Act directed the Secretary of Environment ensure that state environmental agencies management activities are well coordinated and of high quality.

The offices of the Office of the Secretary of Energy and the Office of the Secretary of the Environment were merged in 2013, creating the Office of the Secretary of Energy and Environment.

The Secretary of Environment is responsible for overseeing the development, management and protection of the natural resources and wildlife of the State. The primary duties assigned to the Secretary by law are as follows:

As the State's official Trustee for Natural Resources, the Secretary ensures that natural resources and the services they provide that are injured or lost because of contamination are restored for the benefit of the State.

As of fiscal year 2012, the Secretary of Environment oversees 981.9 full-time employees and is responsible for an annual budget of $590 million.