| Election Name: | 1984 United States Senate election in Delaware |
| Country: | Delaware |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1978 United States Senate election in Delaware |
| Previous Year: | 1978 |
| Next Election: | 1990 United States Senate election in Delaware |
| Next Year: | 1990 |
| Election Date: | November 6, 1984 |
| Image1: | Joe Biden, official 104th Congress photo.png |
| Nominee1: | Joe Biden |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 147,831 |
| Percentage1: | 60.11% |
| Nominee2: | John M. Burris |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 98,101 |
| Percentage2: | 39.89% |
| Map Size: | 210px |
| U.S. Senator | |
| Before Election: | Joe Biden |
| Before Party: | Democratic Party (United States) |
| After Election: | Joe Biden |
| After Party: | Democratic Party (United States) |
The 1984 United States Senate election in Delaware was held on November 6, 1984. Incumbent Democratic Senator Joe Biden won re-election to a third term, defeating Republican challenger John M. Burris.
| County[2] | Joseph Robinette Biden Jr.Democratic | John M. BurrisRepublican | Total votes cast | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| data-sort-type="number" style="text-align:center;" | data-sort-type="number" style="text-align:center;" | % | data-sort-type="number" style="text-align:center;" | data-sort-type="number" style="text-align:center;" | % | data-sort-type="number" style="text-align:center;" | |||||
| Kent | 18,911 | 58.46% | 13,424 | 41.52% | 32,335 | ||||||
| New Castle | 107,636 | 62.22% | 65,352 | 37.78% | 172,988 | ||||||
| Sussex | 21,284 | 52.41% | 19,325 | 47.59% | 40,609 | ||||||
| Totals | 147,831 | 60.11% | 98,101 | 39.89% | 245,932 | ||||||