Diane Lynn Black (née Warren; January 16, 1951) is an American politician who served as a U.S. Representative for Tennessee's 6th congressional district from January 3, 2011, to January 3, 2019. The district includes several suburban and rural areas east of Nashville. A Republican, she was previously elected to the Tennessee Senate, serving as floor leader of the Republican Caucus. She unsuccessfully ran for the Republican nomination in the 2018 Tennessee gubernatorial election.