# 2015 United States House of Representatives elections

There were three special elections to the United States House of Representatives in 2015 during the 115th United States Congress.
All of the elections were won by the party previously holding the seat. Therefore, there were no net changes in party.
Elections are sorted by date and district.

## Summary

| District | Incumbent | Incumbent | Incumbent | This race | This race |
| District | Member | Party | First elected | Results | Candidates |
| New York 11 | Michael Grimm | Republican | 2010 | Incumbent resigned December 30, 2014. A special election was held May 5, 2015. Republican hold. | ▌Y Dan Donovan (Republican) 58.33% ▌Vincent Gentile (Democratic) 40.11% ▌James Lane (Green) 1.33% |
| Mississippi 1 | Alan Nunnelee | Republican | 2010 | Incumbent died February 6, 2015. A special election was held May 12, 2015. Republican hold. | ▌Y Trent Kelly (Republican) 69.97% ▌Walter Zinn (Democratic) 30.03% |
| Illinois 18 | Aaron Schock | Republican | 2008 | Incumbent resigned March 31, 2015. A special election was held September 10, 2015. Republican hold. | ▌Y Darin LaHood (Republican) 68.8% ▌Rob Mellon (Democratic) 31.1% |

## New York's 11th congressional district

A special election was held on May 5, 2015, to fill the vacancy of Michael Grimm, who resigned from Congress on January 5, 2015, after pleading guilty to tax evasion. Local party leaders in Brooklyn and Staten Island selected their nominees, replacing a primary. Republican nominee Dan Donovan was elected to the seat, defeating his Democratic challenger Vincent J. Gentile.
2015 New York's 11th congressional district special election :
| Party | Party | Candidate | Votes | % |
| | Republican | Dan Donovan | 19,065 | 44.85 |
| | Conservative | Dan Donovan | 4,289 | 10.09 |
| | Independence | Dan Donovan | 1,443 | 3.39 |
| | Total | Dan Donovan | 24,797 | 58.33 |
| | Democratic | Vincent Gentile | 15,595 | 36.69 |
| | Working Families | Vincent Gentile | 1,454 | 3.42 |
| | Total | Vincent Gentile | 17,049 | 40.11 |
| | Green | James Lane | 567 | 1.33 |
| | Write-in | Write-in | 96 | 0.23 |
| Total votes | Total votes | Total votes | 42,509 | 100.00 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## Mississippi's 1st congressional district

Representative Alan Nunnelee died on February 6, 2015, after health complications with his brain. Governor Phil Bryant called for a nonpartisan blanket primary to be held on May 12, 2015, with a runoff between the top two finishers on June 2, 2015. The primary consisted of thirteen candidates, with all but one being affiliated with the Republican Party. In the runoff, Republican Trent Kelly defeated Democrat Walter Zinn by a wide margin.
2015 Mississippi's 1st congressional district special runoff election :
| Party | Party | Candidate | Votes | % |
| | Nonpartisan | Trent Kelly | 69,516 | 69.97 |
| | Nonpartisan | Walter Zinn | 29,831 | 30.03 |
| Total votes | Total votes | Total votes | 99,347 | 100.00 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## Illinois's 18th congressional district

A special election was held on September 10, 2015, following the resignation of Aaron Schock on March 31, 2015, amid a scandal involving his use of public and campaign funds. Primary elections were set for July 7 to comply with the UOCAVA, despite Illinois law calling for a stricter deadline. Republican nominee Darin LaHood defeated Democratic nominee Rob Mellon by over thirty percentage points.
2015 Illinois's 18th congressional district special election :
| Party | Party | Candidate | Votes | % |
| | Republican | Darin LaHood | 35,329 | 68.84 |
| | Democratic | Rob Mellon | 15,979 | 31.14 |
| | Write-in | Constant "Conner" Vlakancic | 7 | 0.01 |
| | Write-in | Roger K. Davis | 4 | 0.01 |
| Total votes | Total votes | Total votes | 51,319 | 100.00 |
| | Republican hold | Republican hold | Republican hold | Republican hold |