The 2018 United States Senate election in Nevada took place November 6, 2018, to elect one of two U.S. senators from Nevada. Incumbent Republican senator Dean Heller lost re-election to a second full term, being defeated by Democratic nominee Jacky Rosen.

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2018 United States Senate election in Nevada

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Turnout	62.26%
Nominee Jacky Rosen Dean Heller Party Democratic Republican Popular vote 490,071 441,202 Percentage 50.41% 45.38%
County results Congressional district results Precinct results Rosen:      40–50%      50–60%      60–70%      70–80%      80–90%      >90% Heller:      40–50%      50–60%      60–70%      70–80%      80–90%      >90%
U.S. senator before election Dean Heller Republican Elected U.S. Senator Jacky Rosen Democratic

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Heller had considered a bid for Nevada governor but instead announced he would run for reelection to a second full term. This was the only Republican-held U.S. Senate seat up for election in 2018 in a state Hillary Clinton won in the 2016 presidential election, and one of two Democratic flips in the 2018 U.S. Senate elections.^[1][2] Rosen's victory marked the first time that Nevada had been represented by two women in the United States Senate, and the first time a Democrat had won the Class 1 Senate seat in Nevada since 1994 (as well as the first time both Senate seats were held by Democrats since 2001). Heller was the only Republican incumbent to lose a Senate seat in 2018; he later unsuccessfully ran in the 2022 Republican primary for Governor of Nevada.

The candidate filing deadline was March 16, 2018, and the primary election was held on June 12.^[3]

Nevada is a swing state that once leaned slightly rightward, having voted for George W. Bush twice. But since 2008 it has seen the opposite trend, giving Barack Obama a seven-point victory in 2012 while simultaneously electing Heller to the Senate by one point. Obama also carried Nevada in 2008 by a 12.5% margin. In 2016, the state shifted rightward again, still voting for Hillary Clinton, but only by two points, although Democrat Catherine Cortez Masto managed to win the seat of retiring Democratic Senate leader Harry Reid. Because of the consistent swing nature of the state, many cited Heller as the most vulnerable incumbent Republican in the U.S. Senate up for reelection in 2018, a year with few Republicans in that position; President Donald Trump even warned that if Heller failed to vote to pass the GOP Health care bill to repeal and replace the Affordable Care Act, he could well lose his seat in the next election.^[4][5]

At the end of September 2018, the Brett Kavanaugh Supreme Court nomination became a major element of the campaign. Heller made noncommittal remarks^[6] and a significant campaign was deployed to criticize his support for Kavanaugh.^[7][8]

Rosen is only the 37th sitting House freshman to win a Senate election, the first female representative to do so, and the first one-term House Democrat to become a senator-elect since James Abourezk in 1972.^[9]