| Election Name: | 1986 United States Senate election in North Dakota |
| Country: | North Dakota |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1980 United States Senate election in North Dakota |
| Previous Year: | 1980 |
| Next Election: | 1992 United States Senate election in North Dakota |
| Next Year: | 1992 |
| Election Date: | November 4, 1986 |
| Image1: | Kent Conrad.jpg |
| Nominee1: | Kent Conrad |
| Party1: | North Dakota Democratic-NPL Party |
| Popular Vote1: | 143,932 |
| Percentage1: | 49.80% |
| Nominee2: | Mark Andrews |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 141,812 |
| Percentage2: | 49.07% |
| Map Size: | 250px |
| U.S. Senator | |
| Before Election: | Mark Andrews |
| Before Party: | Republican Party (United States) |
| After Election: | Kent Conrad |
| After Party: | North Dakota Democratic-NPL Party |
The 1986 United States Senate election in North Dakota was held on November 4, 1986. Incumbent Republican U.S. Senator Mark Andrews ran for re-election to a second term, but was defeated by Democratic-NPL nominee Kent Conrad.
Andrews lost re-election by just over 2,000[1] votes after a rigorous campaign involving personal attacks and other strategies[2]