The 1966 Ohio lieutenant gubernatorial election was held on November 8, 1966, to elect the Lieutenant Governor of Ohio. Republican incumbent Lieutenant Governor John William Brown defeated his Democratic opponent William L. Coleman in a landslide, winning 60.29% of the vote.

Republican primary Candidates John William Brown, incumbent Lieutenant Governor of Ohio (1963–1975), (1953–1957) Campaign The Republican primary was held on May 3, 1966. Brown won renomination without opposition. Results

Democratic primary Candidates William L. Coleman, Union County Prosecutor Paul J. Lynch Campaign The Democratic primary was held on May 3, 1966. Coleman defeated Lynch by seven percentage points. Results

General election Candidates John William Brown, incumbent Lieutenant Governor of Ohio (1963–1975), (1953–1957) (Republican) William L. Coleman, Union County Prosecutor (Democratic) Results

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