The 1978 Ohio State Treasurer election was held on November 7, 1978, to elect the Ohio State Treasurer. Primaries were held on June 6, 1978. Democratic incumbent Ohio State Treasurer Gertrude Walton Donahey won re-election to a third term in a landslide, defeating Republican Whitehall City Attorney George C. Rogers by 27 percentage points.

Democratic primary Candidates Gertrude Walton Donahey, incumbent Ohio State Treasurer (1971–1983) Campaign Donahey won renomination unopposed. Results

Republican primary Candidates George C. Rogers, Whitehall City Attorney Richard H. Harris Sam Speck, Ohio State Senator (1977–1983) Campaign George C. Rogers narrowly won the Republican nomination by one percentage point over his closest opponent Richard H. Harris. Results

General election Candidates Gertrude Walton Donahey, incumbent Ohio State Treasurer (1971–1983) (Democratic) George C. Rogers, Whitehall City Attorney (Republican) Results

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