| Election Name: | 2017 Westchester County Executive election |
| After Party: | Democratic Party (United States) |
| After Election: | George Latimer |
| Before Party: | Republican Party (United States) |
| Before Election: | Rob Astorino |
| County Executive | |
| Percentage2: | 43.4% |
| Popular Vote2: | 95,370 |
| Party2: | Republican Party (United States) |
| Candidate2: | Rob Astorino |
| Percentage1: | 56.6% |
| Popular Vote1: | 124,273 |
| Party1: | Democratic Party (United States) |
| Candidate1: | George Latimer |
| Election Date: | November 7, 2017 |
| Next Year: | 2021 |
| Next Election: | 2021 Westchester County Executive election |
| Previous Year: | 2013 |
| Previous Election: | 2013 Westchester County Executive election |
| Ongoing: | no |
| Type: | Mayoral |
| Country: | Westchester County |
| Turnout: | 36.7% |
The 2017 Westchester County Executive election was held on November 7, 2017. After a primary in September, State Senator George Latimer was chosen as the Democratic Party candidate to challenge incumbent County Executive Rob Astorino. Latimer defeated Astorino, 56.6%-43.4%. The County Executive race took place along side elections for the county legislature.
| 2017 Westchester County Executive election[1] | |||||
|---|---|---|---|---|---|
| Party | Candidate | Votes | Percentage | ||
| Democratic | George S. Latimer | 116,834 | 53.2% | ||
| Working Families | George S. Latimer | 4,034 | 1.8% | ||
| Independence | George S. Latimer | 2,214 | 1.0% | ||
| Women's Equality | George S. Latimer | 960 | 0.4% | ||
| Reform | George S. Latimer | 231 | 0.1% | ||
| Total | George S. Latimer | 124,273 | 56.6% | ||
| Republican | Rob Astorino | 82,929 | 37.8% | ||
| Conservative | Rob Astorino | 12,441 | 5.7% | ||
| Total | Rob Astorino (incumbent) | 95,370 | 43.4% | ||
| Majority | 28,903 | 13.2% | |||
| Totals | 219,764 | 100.0% | |||
| Democratic gain from Republican | |||||