| Election Name: | 1966 Arkansas gubernatorial election |
| Country: | Arkansas |
| Flag Year: | 1924 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1964 Arkansas gubernatorial election |
| Previous Year: | 1964 |
| Next Election: | 1968 Arkansas gubernatorial election |
| Next Year: | 1968 |
| Election Date: | November 8, 1966 |
| Image1: | Winthrop Rockefeller 1967 (cropped).jpg |
| Nominee1: | Winthrop Rockefeller |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 306,324 |
| Percentage1: | 54.36% |
| Nominee2: | James D. Johnson |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 257,203 |
| Percentage2: | 45.64% |
| Map Size: | 210px |
| Governor | |
| Before Election: | Orval Faubus |
| Before Party: | Democratic Party (United States) |
| After Election: | Winthrop Rockefeller |
| After Party: | Republican Party (United States) |
The 1966 Arkansas gubernatorial election was held on November 8, 1966. Winthrop Rockefeller was elected governor of Arkansas, becoming the first Republican to be elected to the office since Reconstruction in 1872.
The election occurred amidst strong midterm results for the Republican Party nationally, and in the traditionally-Democratic South. Republicans concurrently won the governorship of Florida also for the first time since Reconstruction, and only narrowly lost the governorship of Georgia, despite winning a plurality of the vote.
Popular and powerful six-term (since 1955) incumbent Orval E. Faubus decided against seeking re-election. "Justice Jim" Johnson, a political ally of George C. Wallace of Alabama, ran a segregationist campaign with support of the White Citizens Council. A decade earlier, Johnson had run in the Democratic primary against Faubus, another segregationist, whom he accused of working behind the scenes for racial integration.
Holt was supported by many younger, more liberal, Democrats, such as future governor and U.S. President Bill Clinton, who served as his campaign aide though he was not old enough to vote at the time.
A northeastern native, multimillionaire and scion of a prominent political/business family Winthrop Rockefeller was nominated with over 96% of the vote over Gus McMillan of Sheridan. Charges abounded that McMillan, a lifelong Democrat, was planted in the race by Faubus in order to force the Republicans to hold an expensive and needless primary. Rockefeller had been the GOP nominee in the 1964 election.
Rockefeller was an unusual candidate – an eastern establishment member and moderate-to-liberal party wing member (such as his brother, Governor Nelson Rockefeller of New York, an unofficial leader of this wing for many years).
The Republican Party at this time practically played only a most minor role in Arkansas politics.
However, his popularity and the break within Democratic camp, where many were outraged with Johnson's segregationist stances, and good year for the Republicans nationally helped Rockefeller to win.