| Election Name: | 1998 Cork South-Central by-election |
| Country: | Ireland |
| Type: | presidential |
| Ongoing: | no |
| Previous Year: | 1997 general election |
| Election Date: | 23 October 1998 |
| Next Year: | 2002 general election |
| Turnout: | 43,007 (49.1%) |
| 2Blank: | Percentage |
| 3Blank: | Final count |
| Nominee1: | Simon Coveney |
| Party1: | Fine Gael |
| 1Data1: | 16,212 |
| 2Data1: | 37.7 |
| 3Data1: | 23,230 |
| Nominee2: | Sinead Behan |
| Party2: | Fianna Fáil |
| 1Data2: | 12,658 |
| 2Data2: | 29.4 |
| 3Data2: | 16,379 |
| Nominee3: | Toddy O'Sullivan |
| Party3: | Labour Party (Ireland) |
| 1Data3: | 8,171 |
| 2Data3: | 19.0 |
| 3Data3: | – |
| Nominee4: | Dan Boyle |
| Party4: | Green Party (Ireland) |
| 1Data4: | 3,461 |
| 2Data4: | 8.1 |
| 3Data4: | – |
| Nominee5: | Henry Cremin |
| Party5: | Sinn Féin |
| 1Data5: | 1,158 |
| 2Data5: | 2.7 |
| 3Data5: | – |
| Nominee6: | Peter Kelly |
| Party6: | Progressive Democrats |
| 1Data6: | 971 |
| 2Data6: | 2.3 |
| 3Data6: | – |
| Nominee7: | Benny Cooney |
| Party7: | Independent politician |
| 1Data7: | 197 |
| 2Data7: | 0.5 |
| 3Data7: | – |
| Nominee8: | Brian McEnery |
| Party8: | Natural Law Party |
| 1Data8: | 150 |
| 2Data8: | 0.4 |
| 3Data8: | – |
| Nominee9: | Jim Tallon |
| Party9: | Independent politician |
| 1Data9: | 29 |
| 2Data9: | 0.1 |
| 3Data9: | – |
| Map Size: | 200px |
| TD | |
| Before Election: | Hugh Coveney |
| Before Party: | Fine Gael |
| After Election: | Simon Coveney |
| After Party: | Fine Gael |
A by-election was held in the Dáil Éireann Cork South-Central constituency in Ireland on 23 October 1998. It followed the death of Fine Gael Teachta Dála (TD) Hugh Coveney on 14 March 1998.
The election was won by Simon Coveney of Fine Gael and son of Hugh Coveney. The other candidates being Sinead Behan for Fianna Fáil, Cork City Councillor and former TD Toddy O'Sullivan for the Labour Party, Cork City Councillor Dan Boyle for the Green Party, Henry Cremin for Sinn Féin, Peter Kelly for the Progressive Democrats, Benny Cooney as an Independent, Brian McEnery for Natural Law and Jim Tallon as an Independent.
Dan Boyle would go on to represent the constituency as a TD in the future.