| Election Name: | 1966 U.S. Senate Democratic primary in Arkansas |
| Country: | Arkansas |
| Flag Year: | 1924 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1960 United States Senate election in Arkansas |
| Previous Year: | 1960 |
| Next Election: | 1972 United States Senate election in Arkansas |
| Next Year: | 1972 |
| Election Date: | July 26, 1966 |
| Image1: | File:John L McClellan.png |
| Nominee1: | John L. McClellan |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 310,526 |
| Percentage1: | 77.19% |
| Nominee2: | Foster Johnson |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 91,746 |
| Percentage2: | 22.81% |
| U.S. Senator | |
| Before Election: | John L. McClellan |
| Before Party: | Democratic Party (United States) |
| After Election: | John L. McClellan |
| After Party: | Democratic Party (United States) |
The 1966 United States Senate election in Arkansas took place on November 8, 1966. Incumbent U.S. Senator John L. McClellan was re-elected to a fifth term in office.
Because the Republican Party (or any other party) did not field a candidate in the general election, McClellan's primary victory was tantamount to election.
For the first time since 1954, Senator John McClellan faced a challenger for the Democratic nomination, Foster Johnson, a 51-year-old book salesman and political neophyte. McClellan did not stage a formal campaign for re-election and ignored his opponent.[1] Johnson did win the support of organized labor in the state but attracted little attention to his campaign otherwise.[1]
McClellan was unopposed in the general election. At this time, Arkansas law did not require tabulation of votes for unopposed candidates.[2]
1966 United States Senate elections