| Election Name: | 1890 Delaware gubernatorial election |
| Country: | Delaware |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1886 Delaware gubernatorial election |
| Previous Year: | 1886 |
| Next Election: | 1894 Delaware gubernatorial election |
| Next Year: | 1894 |
| Election Date: | November 4, 1890 |
| Nominee1: | Robert J. Reynolds |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 17,801 |
| Percentage1: | 50.43% |
| Nominee2: | Harry A. Richardson |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 17,258 |
| Percentage2: | 48.89% |
| Map Size: | 210px |
| Governor | |
| Before Election: | Benjamin T. Biggs |
| Before Party: | Democratic Party (United States) |
| After Election: | Robert J. Reynolds |
| After Party: | Democratic Party (United States) |
The 1890 Delaware gubernatorial election was held on November 4, 1890. Incumbent Democratic Governor Benjamin T. Biggs was unable to seek a second consecutive term in office. Former State Treasurer Robert J. Reynolds won the Democratic nomination to succeed Biggs, and in the general election, he faced banker Harry A. Richardson, the Republican nominee. In stark contrast to the 1886 election, the Republican Party fully contested the state's elections and a close contest ensued. Reynolds ultimately defeated Richardson by a narrow margin, winning by just 543 votes.