Primary elections for the United States Senate, United States House of Representatives, Tennessee Senate, and Tennessee House of Representatives, as well as various judicial retention elections, including elections for two Tennessee Supreme Court justices, were held on August 7, 2008.

Mike Huckabee won Tennessee's Republican primary over Senator John McCain of Arizona.

Former first lady Hillary Clinton defeated Senator Barack Obama of Illinois in the Tennessee Democratic primary.

The election of all 99 seats in the Tennessee House of Representatives occurred on November 4, 2008.

All incumbent Tennessee Supreme Court Justices won their retention elections, getting eight more years.