HAWAII — U.S. Representatives Ed Case and Jill Tokuda are facing contested Democratic primaries in Hawaii's 2026 elections. The filing deadline for candidates in the U.S. House of Representatives races was June 2, 2026, setting the stage for primaries on August 8, 2026.

A total of eleven candidates filed for Hawaii's two U.S. House congressional districts, including nine Democrats and two Republicans. Six candidates are running for Hawaii's 1st Congressional District, which includes Representative Ed Case. This field includes Case, four other Democrats, and one Republican. Candidates also filed to run in the Republican and Democratic primaries in the 2nd Congressional District, where Representative Jill Tokuda is the incumbent seeking re-election.

In Hawaii, the winner of a primary election is the candidate who receives the greatest number of votes. A candidate does not need to win an outright majority of votes cast to be declared the winner in a primary election.

Two Democratic primaries are contested in Hawaii for 2026. In 2024, there was one contested primary, which involved an incumbent. In 2022, there were four contested primaries, one of which featured an incumbent. In 2020, there were three contested primaries, with no incumbents facing challenges. In 2018, there were three contested primaries, with one incumbent facing a challenge. The 2016 election saw three contested primaries and one incumbent facing a primary. In 2014, there were three contested primaries, and no incumbents were challenged.

No U.S. House districts in Hawaii are open in 2026, meaning all incumbents are seeking re-election. In 2024, there were no open U.S. House districts in Hawaii. In each of the election cycles from 2014 through 2022, there was one open U.S. House district in Hawaii.