The 2004 United States Senate election in Hawaii took place on November 2, 2004 alongside other elections to the United States Senate in other states as well as elections to the United States House of Representatives and various state and local elections. Incumbent Democrat U.S. Senator Daniel Inouye won re-election to an eighth term in yet another landslide with over 75% of the vote, despite the state's relatively close single-digit margin of victory for John Kerry in the concurrent presidential election.

Major candidates

Democratic

Republican

General election

Predictions

Results

Inouye won every county with at least 70% of the vote. His best performance was in Kauai County, where he won with about 80%; also was Cavasso's weakest performance, getting just 16.5% of the vote there.