2020 United States Senate election in Texas

Incumbent Republican Senator John Cornyn won re-election to a fourth term against Democratic nominee MJ Hegar by 9.6%.

Prior to the election, most news organizations projected this race as "Lean Republican", and was not expected to be as competitive as the contest for Texas's other Senate seat two years prior, when Republican incumbent Ted Cruz defeated Democrat Beto O'Rourke by a 2.6% margin.

Cornyn outperformed President Donald Trump in the state by about 4%, and was able to carry two counties won by Joe Biden (Tarrant and Williamson).

While Cornyn did better than Trump in the Texas Triangle, contributing to his over performance, Hegar slightly outperformed Biden in the heavily Hispanic Rio Grande Valley, and was able to carry one Trump county (Zapata), though Hegar herself vastly underperformed previous Democratic margins in the region.

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Results by county:
Cornyn
  • Cornyn—80–90%
  • Cornyn—70–80%
  • Cornyn—60–70%
  • Cornyn—50–60%
Initial round results by county:
Hegar
  • Hegar—60–70%
  • Hegar—50–60%
  • Hegar—40–50%
  • Hegar—30–40%
  • Hegar—20–30%
  • Hegar—<20%
Tie
  • Tie
West
  • West—<20%
  • West—20–30%
  • West—30–40%
  • West—40–50%
Ramirez
  • Ramirez—<20%
  • Ramirez—20–30%
  • Ramirez—30–40%
  • Ramirez—40–50%
  • Ramirez—50–60%
Garcia
  • Garcia—<20%
  • Garcia—20–30%
  • Garcia—30–40%
  • Garcia—100%
Edwards
  • Edwards—<20%
  • Edwards—20–30%
  • Edwards—30–40%
Bell
  • Bell—<20%
  • Bell—20–30%
  • Bell—30–40%
  • Bell—40–50%
Hernandez
  • Hernandez—<20%
  • Hernandez—20–30%
  • Hernandez—30–40%
Cooper
  • Cooper—<20%
  • Cooper—20–30%
Runoff results by county
Hegar
  • Hegar—>90%
  • Hegar—80–90%
  • Hegar—70–80%
  • Hegar—60–70%
  • Hegar—50–60%
Tie
  • Tie
West
  • West—50–60%
  • West—60–70%
  • West—70–80%
  • West—>90%
No vote
  • No vote