Bầu cử thống đốc Maryland năm 1966

The 1966 Maryland gubernatorial election was held on November 8, 1966. Incumbent Democratic governor J. Millard Tawes was unable to seek a third term in office. In the election to succeed him, George P. Mahoney, a controversial segregationist, emerged from the Democratic primary due to splintered support for the two major candidates. Baltimore County Executive Spiro Agnew, was nominated by the Republican Party as their gubernatorial candidate. Mahoney and Agnew squared off, along with independent candidate Hyman A. Pressman. Ultimately, Agnew was victorious over Mahoney, with Pressman a distant third. This year was the last time that the state of Maryland elected a Republican governor until 2002. Agnew was later nominated for vice president by the Republican National Convention, per Richard Nixon's request, in 1968, an election he and Nixon won.

This election marks the last time the following Independent city and Counties have voted Republican in a gubernatorial election: Baltimore City, Montgomery, and Prince George's.