John K. Mahoney (September 9, 1949 – April 5, 2011) was a former member of the Ohio Senate, representing the 10th District from January 3, 1977 – December 31, 1980.

While in the Senate, he was initiated reform that influenced what today is the Ohio Lottery.

He attended Catholic Central High School and Spalding University.

From 1981 to 1985, Mahoney was chief of staff for Ohio Senate Democrats.

In 1986, Mahoney became the Deputy Director of the Ohio Municipal League.