Jeffrey DeWit (born 1972/73) is an American businessman and politician from the state of Arizona. A member of the Republican Party, DeWit became the State Treasurer of Arizona in 2015, succeeding Doug Ducey. DeWit said in 2016 that he did not plan to seek re-election in 2018. In 2017, President Trump nominated him to be chief financial officer of NASA. His nomination as chief financial officer of NASA was confirmed by the U.S. Senate in March 2018. He resigned from NASA in February 2020 and joined Trump's 2020 campaign later that year.