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The 2026 United States Senate election in Iowa will be held on November 3, 2026, to elect a member of the United States Senate to represent the state of Iowa. Republican incumbent Joni Ernst declined to seek re-election to a third term. Primary elections will be held on June 2, 2026.
| Campaign finance reports as of April 18, 2026 | |||
| Candidate | Raised | Spent | Cash on hand |
| Jim Carlin (R) | $293,966 | $279,387 | $14,578 |
| Ashley Hinson (R) | $7,267,266 | $2,679,198 | $6,516,143 |
| Joni Ernst (R) | $6,954,692 | $5,485,942 | $1,997,164 |
| Source: Federal Election Commission | |||
| Poll source | Date(s) administered | Sample size | Margin of error | Joni Ernst | Someone Else | Undecided |
| Victory Insights (R) | December 6–7, 2024 | 600 (LV) | – | 48% | 27% | 26% |
| Campaign finance reports as of April 18, 2026 | |||
| Candidate | Raised | Spent | Cash on hand |
| Nathan Sage (D) | $1,432,562 | $1,432,459 | $102 |
| Josh Turek (D) | $2,808,701 | $2,051,221 | $757,480 |
| Zach Wahls (D) | $3,167,670 | $2,112,265 | $1,055,405 |
| Jackie Norris (D) | $363,563 | $363,563 | $0 |
| J. D. Scholten (D) | $213,415 | $205,271 | $8,144 |
| Source: Federal Election Commission | |||
| Poll source | Date(s) administered | Sample size | Margin of error | Josh Turek | Zach Wahls | Other | Undecided |
| Public Policy Polling (D) | May 5–6, 2026 | 764 (LV) | ± 3 % | 53% | 27% | – | 20% |
| Public Policy Polling (D) | April 23, 2026 | – (LV) | – | 41% | 23% | – | 36% |
| FM3 Research (D) | April 21–23, 2026 | 600 (LV) | ± 4 % | 48% | 28% | – | 24% |
| Bedrock Polling | March 26, 2026 | 1,022 (LV) | ± 3 % | 38% | 56% | – | 6% |
| FM3 Research (D) | March 11–14, 2026 | 600 (LV) | ± 4 % | 25% | 34% | – | 41% |
| GQR (D) | February 18–22, 2026 | 605 (LV) | – | 24% | 42% | – | 34% |
| NRSC (R) | February 16–18, 2026 | 1,923 (LV) | ± 2 % | 23% | 30% | 5% | 42% |
| Campaign finance reports as of April 18, 2026 | |||
| Candidate | Raised | Spent | Cash on hand |
| Thomas Laehn (L) | $42,944 | $37,430 | $5,513 |
| Source: Federal Election Commission | |||