| Election Name: | 1998 United States Senate election in Louisiana |
| Country: | Louisiana |
| Flag Year: | 1912 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1992 United States Senate election in Louisiana |
| Previous Year: | 1992 |
| Next Election: | 2004 United States Senate election in Louisiana |
| Next Year: | 2004 |
| Election Date: | November 3, 1998 |
| Image1: | File:John Breaux, official photo portrait, standing (cropped).jpg |
| Nominee1: | John Breaux |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 620,502 |
| Percentage1: | 64.02% |
| Nominee2: | Jim Donelon |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 306,616 |
| Percentage2: | 31.64% |
| Map Size: | 300px |
| U.S. Senator | |
| Before Election: | John Breaux |
| Before Party: | Democratic Party (United States) |
| After Election: | John Breaux |
| After Party: | Democratic Party (United States) |
The 1998 United States Senate election in Louisiana was held November 3, 1998. Incumbent Senator John Breaux won re-election to a third term., this is the last time that the Democrats have won the Class 3 Senate seat from Louisiana.