HAWAII — Both of Hawaii's U.S. House incumbents, Rep. Ed Case (D-1st) and Rep. Jill Tokuda (D-2nd), are running in contested primaries for the 2026 election. The filing deadline for candidates was June 2, 2026, and the primaries are scheduled for August 8, 2026.

This marks the first time since 2014 that both of Hawaii's U.S. House incumbents face primary challengers. Candidates filed to run in the Republican and Democratic primaries for both of Hawaii's U.S. House districts. No U.S. House districts in Hawaii are open in 2026.

Six candidates are running for Hawaii's 1st Congressional District, including Case, four other Democrats, and one Republican. For Hawaii's two congressional districts combined, eleven candidates are running in total, consisting of nine Democrats and two Republicans.

Historical data shows varying levels of incumbent competition. One incumbent ran in a contested primary in 2024, and another ran in 2022. No incumbents ran in contested primaries in 2020. One incumbent ran in contested primaries in both 2018 and 2016. In 2014, no incumbents ran in contested primaries.

The overall number of candidates per district in Hawaii for U.S. House races has varied in recent years. In 2026, there are 5.5 candidates per district. This number is higher than the 2.5 candidates per district in 2024. In 2022, there were 6.5 candidates per district, while in 2020, this figure was 9.5. There were 6.5 candidates per district in 2018, and six candidates per district in both 2016 and 2014.

In Hawaii primary elections, the winner is the candidate who receives the greatest number of votes. There is no requirement for a primary winner to achieve an outright majority of the votes cast.