| Election Name: | 1990 United States Senate election in Delaware |
| Country: | Delaware |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1984 United States Senate election in Delaware |
| Previous Year: | 1984 |
| Next Election: | 1996 United States Senate election in Delaware |
| Next Year: | 1996 |
| Election Date: | November 6, 1990 |
| Image1: | Joe Biden in 1987 at White House.png |
| Nominee1: | Joe Biden |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 112,918 |
| Percentage1: | 62.68% |
| Nominee2: | M. Jane Brady |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 64,554 |
| Percentage2: | 35.83% |
| 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 1990 United States Senate election in Delaware was held on November 6, 1990. Incumbent Democratic U.S. Senator Joe Biden won re-election to a fourth term, defeating Republican challenger M. Jane Brady.
| District[2] | Joseph R. Biden Jr.Democratic | M. Jane BradyRepublican | Lee RosenbaumLibertarian | ||||
|---|---|---|---|---|---|---|---|
| District 1 | 3,289 | 829 | 72 | ||||
| District 2 | 1,904 | 170 | 24 | ||||
| District 3 | 1,604 | 133 | 20 | ||||
| District 4 | 3,204 | 1,762 | 79 | ||||
| District 5 | 2,992 | 643 | 51 | ||||
| District 6 | 2,385 | 1,484 | 63 | ||||
| District 7 | 3,250 | 2,419 | 97 | ||||
| District 8 | 2,817 | 1,669 | 71 | ||||
| District 9 | 2,361 | 1,142 | 55 | ||||
| District 10 | 2,688 | 2,019 | 70 | ||||
| District 11 | 3,111 | 2,999 | 87 | ||||
| District 12 | 3,307 | 2,878 | 68 | ||||
| District 13 | 2,915 | 1,313 | 53 | ||||
| District 14 | 2,758 | 841 | 40 | ||||
| District 15 | 2,488 | 613 | 35 | ||||
| District 16 | 2,551 | 709 | 50 | ||||
| District 17 | 3,343 | 1,393 | 89 | ||||
| District 18 | 2,275 | 1,098 | 63 | ||||
| District 19 | 3,191 | 1,591 | 63 | ||||
| District 20 | 4,260 | 2,872 | 106 | ||||
| District 21 | 2,834 | 1,775 | 77 | ||||
| District 22 | 3,165 | 2,568 | 90 | ||||
| District 23 | 2,380 | 1,517 | 83 | ||||
| District 24 | 2,215 | 1,323 | 73 | ||||
| District 25 | 1,756 | 1,113 | 67 | ||||
| District 26 | 2,884 | 1,401 | 87 | ||||
| District 27 | 3,797 | 2,263 | 94 | ||||
| District 28 | 2,694 | 1,150 | 71 | ||||
| District 29 | 2,302 | 1,460 | 85 | ||||
| District 30 | 2,194 | 1,408 | 76 | ||||
| District 31 | 2,562 | 1,812 | 56 | ||||
| District 32 | 1,765 | 1,414 | 63 | ||||
| District 33 | 2,175 | 1,717 | 69 | ||||
| District 34 | 1,593 | 1,377 | 57 | ||||
| District 35 | 2,209 | 1,480 | 67 | ||||
| District 36 | 2,847 | 1,734 | 45 | ||||
| District 37 | 3,891 | 2,742 | 83 | ||||
| District 38 | 4,030 | 2,713 | 65 | ||||
| District 39 | 2,571 | 1,823 | 32 | ||||
| District 40 | 3,035 | 1,490 | 34 | ||||
| District 41 | 3,326 | 1,697 | 50 | ||||
| Total | 112,918 | 64,554 | 2,680 |