Dewey Follett Bartlett Sr. was an American politician who served as the 19th governor of Oklahoma from 1967 to 1971, following his fellow Republican, Henry Bellmon. In 1966, he became the first Roman Catholic elected governor of Oklahoma, defeating the Democratic nominee, Preston J. Moore of Oklahoma City. He was defeated for reelection in 1970 by Tulsa attorney David Hall in the closest election in state history. He was elected to the United States Senate in 1972 and served one term. In 1978, he was diagnosed with lung cancer and did not run for reelection that year. He died of complications of lung cancer two months after retiring from the Senate in 1979.

The governor of Oklahoma is the head of government of the U.S. state of Oklahoma. Under the Oklahoma Constitution, the governor serves as the head of the Oklahoma executive branch, of the government of Oklahoma. The governor is the ex officio commander-in-chief of the Oklahoma National Guard when not called into federal use. Despite being an executive branch official, the governor also holds legislative and judicial powers. The governor's responsibilities include making yearly "State of the State" addresses to the Oklahoma Legislature, submitting the annual state budget, ensuring that state laws are enforced, and that the peace is preserved. The governor's term is four years in length.