The 1976 United States Senate election in Hawaii took place on November 2, 1976. Incumbent Republican U.S. Senator Hiram Fong decided to retire, instead of seeking re-election to a fourth term. Democrat Spark Matsunaga won the open seat by defeating Republican William Quinn.
1976 United States Senate election in Hawaii|
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 County results Matsunaga: 50–60% 60–70% |
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Both US House representatives Spark Matsunaga from the 1st district and Patsy Mink from the 2nd district ran in the Democratic primary, which Matsunaga won.