Dave Treen, American lawyer and politician, 51st Governor of Louisiana (d. 2009)
David Conner Treen Sr. (July 16, 1928 – October 29, 2009) was an American politician and attorney from Louisiana. A member of the Republican Party, Treen served as U.S. Representative for Louisiana's 3rd congressional district from 1973 to 1980 and Governor of Louisiana from 1980 to 1984. Treen was the first Republican elected to both offices since Reconstruction.

Born in Baton Rouge, Louisiana, Treen grew up in New Orleans and later settled in Metairie. After three unsuccessful runs for Congress in the 1960s, Treen won his first election in 1972 to represent a U.S. House district that covered parts of Greater New Orleans and Acadiana. In Congress, Treen had a reliably conservative voting record, and he subsequently won reelection three times by increasing margins. Treen was among the inaugural members of the House Select Committee on Intelligence when it was created in 1975.

In 1979, Treen won election as governor of Louisiana, and he resigned from the House in 1980 to take office as governor. During his single term as governor, Treen cut the state income tax and created a professional development program for teachers. Treen also signed legislation creating the Louisiana School for Math, Science and the Arts and Louisiana Department of Environmental Quality. However, as the Treen administration took place during the early 1980s recession, Louisiana faced increasing unemployment and bond debt. Treen lost his reelection bid in 1983 to Edwin Edwards, who had served as governor before Treen.

After leaving the governor's office, Treen continued to be politically involved in Louisiana, running for Congress and endorsing gubernatorial candidates as recently as 2008 before his death in 2009.