The 1970 Ohio State Auditor election was held on November 3, 1970, to elect the Ohio State Auditor. Primaries were held on May 5, 1970. Republican incumbent Ohio State Auditor Roger Cloud chose to unsuccessfully run for Ohio Attorney General rather than seek another term as Auditor. Democratic former Ohio State Auditor Joseph T. Ferguson won the election, defeating Republican Ohio State House Representative Roger Tracy by a narrow margin of just one percentage point.

Republican primary Candidates Roger Tracy, Ohio State House Representative (1967–1970) James J. Barton Campaign Tracy easily won the Republican nomination in a landslide over Barton, winning with nearly 80% of the vote. Results

Democratic primary Candidates Joseph T. Ferguson, former Ohio State Treasurer (1959–1963), former Ohio State Auditor (1937–1953) Samuel H. Rugg Shaw A. Ferguson Campaign Ferguson easily won the nomination by over 40 percentage points against his two primary opponents. Results

General election Candidates Joseph T. Ferguson, former Ohio State Treasurer (1959–1963), former Ohio State Auditor (1937–1953) (Democratic) Roger Tracy, Ohio State House Representative (1967–1970) (Republican) Results

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