| Election Name: | 1998 United States Senate election in Ohio |
| Country: | Ohio |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1992 United States Senate election in Ohio |
| Previous Year: | 1992 |
| Next Election: | 2004 United States Senate election in Ohio |
| Next Year: | 2004 |
| Election Date: | November 3, 1998 |
| Image1: | George Voinovich official portrait (1).jpg |
| Nominee1: | George Voinovich |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 1,922,087 |
| Percentage1: | 56.46% |
| Nominee2: | Mary Boyle |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 1,482,054 |
| Percentage2: | 43.54% |
| Map Size: | 210px |
| U.S. Senator | |
| Before Election: | John Glenn |
| Before Party: | Democratic Party (United States) |
| After Election: | George Voinovich |
| After Party: | Republican Party (United States) |
The 1998 United States Senate election in Ohio was held November 3, 1998. It was concurrent with elections to the United States House of Representatives. Incumbent Democratic U.S Senator John Glenn decided to retire, instead of seeking a fifth term. Republican Governor George Voinovich won the open seat.[1] This was the first open-seat Senate election in Ohio for this seat since 1920.