Bầu cử Thượng viện Hoa Kỳ tại Arizona năm 2024

The 2024 United States Senate election in Arizona was held on November 5, 2024, to elect a member of the United States Senate to represent the state of Arizona. Democratic Congressman Ruben Gallego won his first term in office, defeating Republican former news anchor Kari Lake. He succeeded independent incumbent Kyrsten Sinema, who did not seek a second term.

Sinema, who was elected as a Democrat, was considered vulnerable to a primary challenge due to frequently opposing her party's legislative agenda. After preparing a re-election bid as an independent, Sinema announced she would retire from the Senate. Gallego ran unopposed in the Democratic primary. Lake, the Republican nominee in the 2022 Arizona gubernatorial election, won her party's nomination with 55% of the vote against Pinal County sheriff Mark Lamb. The election was considered among the most competitive Senate races in 2024. Most polls and ratings had Gallego as the favorite to win. Gallego defeated Lake by 2.41 percentage points, a closer race than polls had projected for most of the campaign. Republican presidential candidate Donald Trump's wider-than-expected victory in the state likely contributed to this, but there was also a significant amount of ticket splitting between the presidential and senatorial races.

Gallego outperformed Kamala Harris by the fourth-largest margin among Democratic Senate candidates in 2024, and the largest margin for a non-incumbent. Gallego particularly benefitted from ticket splitting among Hispanics, who according to exit polls gave Gallego 60% of their votes, compared to 54% for Harris. Specifically, Gallego received 93,475 more votes than Harris, while Lake received 174,481 fewer votes than Donald Trump. This election marked the fourth consecutive election cycle in which Democrats won a Senate election in Arizona.

This was the first time that Arizona voted for candidates of different political parties for U.S. senator and president since Democrat Dennis DeConcini was reelected as Republican George H. W. Bush carried the state in 1988. Gallego also became the first Latino elected to the Senate from Arizona, a state with a large Latino population. This was the first time since 2006 that any candidate won a majority of the vote in this seat. Republicans have not won a Senate race in Arizona since 2016.

Similarly to the 2022 Arizona gubernatorial election, Lake refused to concede defeat.