Boe:      50-60%      60-70%      70-80%      80-90% Nils Boe Republican Nils Boe Republican Measure 9 Amendment A Amendment E Amendment G The 1966 South Dakota gubernatorial election was held on November 8, 1966.

Incumbent Republican Governor Nils Boe defeated Democratic nominee Robert Chamberlin with 57.71% of the vote.

Primary elections were held on June 7, 1966.