| Election Name: | 2018 Delaware State Treasurer election |
| Country: | Delaware |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 2014 Delaware State Treasurer election |
| Previous Year: | 2014 |
| Next Election: | 2022 Delaware State Treasurer election |
| Next Year: | 2022 |
| Election Date: | November 6, 2018 |
| Image1: | Colleen Davis (52834741300) (cropped).jpg |
| Nominee1: | Colleen Davis |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 187,240 |
| Percentage1: | 52.4% |
| Nominee2: | Ken Simpler |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 164,001 |
| Percentage2: | 45.9% |
| Map Size: | 210px |
| Treasurer | |
| Before Election: | Ken Simpler |
| Before Party: | Republican Party (United States) |
| After Election: | Colleen Davis |
| After Party: | Democratic Party (United States) |
The 2018 Delaware State Treasurer election took place on November 6, 2018. The Delaware primary election for federal and state candidates took place on September 6, 2018. Incumbent State Treasurer Ken Simpler announced on November 2, 2017, that he would seek re-election to a second term. He lost the general election to Democratic nominee Colleen Davis.[1]
Ken Simpler ran unopposed in the primary and automatically became the Republican nominee.