| Election Name: | 1970 United States Senate election in Hawaii |
| Country: | Hawaii |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1964 United States Senate election in Hawaii |
| Previous Year: | 1964 |
| Next Election: | 1976 United States Senate election in Hawaii |
| Next Year: | 1976 |
| Election Date: | November 3, 1970 |
| Image1: | File:Hiram Fong.jpg |
| Nominee1: | Hiram Fong |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 124,163 |
| Percentage1: | 51.57% |
| Nominee2: | Cecil Heftel |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 116,597 |
| Percentage2: | 48.43% |
| Map Size: | 300px |
| U.S. Senator | |
| Before Election: | Hiram Fong |
| Before Party: | Republican Party (United States) |
| After Election: | Hiram Fong |
| After Party: | Republican Party (United States) |
The 1970 United States Senate election in Hawaii took place on November 3, 1970. Incumbent Republican Senator Hiram Fong was re-elected to a third term in office, narrowly defeating Democratic businessman Cecil Heftel.
According to the Honolulu Star-Bulletin, Fong's support for the Vietnam War led to his close-call in the 1970 election.[1] As of, this remains the last U.S. Senate election in Hawaii won by a Republican.