The 2018 United States Senate election in Texas was held on November 6, 2018, along with other elections to the United States Senate and elections to the United States House of Representatives in additional states. Incumbent Republican U.S. Senator Ted Cruz won re-election to a second term defeating Democratic candidate Beto O'Rourke. The primary for all parties was held on March 6, 2018, making it the first primary of the 2018 season. As Cruz and O'Rourke both won majorities in their primaries, they did not participate in the May 22 runoff primary that was held for some nominations in Texas.

Robert Francis "Beto" O'Rourke is an American politician who served as the U.S. representative for Texas's 16th congressional district from 2013 to 2019. A member of the Democratic Party, O'Rourke was the party's nominee for the U.S. Senate in 2018, a candidate for the presidential nomination in 2020, and the party's nominee for the 2022 Texas gubernatorial election.