The 2008 United States Senate election in Texas was held on November 4, 2008. Incumbent Republican John Cornyn defeated Democratic nominee Rick Noriega, a member of the Texas House of Representatives, to win election to a second term. Cornyn increased his margin from 2002 in 2008 by 0.01%, an incredibly minuscule shift right.
Cornyn, running as an incumbent, had a 42% approval rating with a 43% disapproval rating in June 2007. Texas is a red state, that Republican presidential nominee John McCain won with over 55% of the vote. Cornyn slightly underperformed McCain. However, Noriega underperformed both 2008 Democratic presidential candidate Barack Obama in Texas and Cornyn's 2002 opponent, Ron Kirk, with Noriega receiving just 42.8% of the vote.