1966 United States Senate election in Minnesota

The 1966 United States Senate election in Minnesota took place on November 8, 1966. Incumbent Democratic U.S. Senator Walter Mondale, who had originally been appointed in 1964 to replace Hubert Humphrey after Humphrey was elected Vice President of the United States, defeated Republican challenger Robert A. Forsythe, to win a full term.

Declared

 * Ralph E. Franklin
 * Walter Mondale, Incumbent U.S. Senator since 1964

Declared

 * Robert A. Forsythe, businessman
 * Henry A. Johnsen