Ohio Rev. Code § 4705.01
No person shall be permitted to practice as an attorney and counselor at law, or to commence, conduct, or defend any action or proceeding in which the person is not a party concerned, either by using or subscribing the person's own name, or the name of another person, unless the person has been admitted to the bar by order of the supreme court in compliance with its prescribed and published rules. Except as provided in section 4705.09 of the Revised Code or in rules adopted by the supreme court, admission to the bar shall entitle the person to practice before any court or administrative tribunal without further qualification or license.
No sheriff shall practice as an attorney at law in any court of this state, and no clerk of the supreme court or court of common pleas, or the deputy of either, shall practice in the particular court of which that person is clerk or deputy.
No coroner in a county with a population of one hundred seventy-five thousand one or more who elects not to engage in the private practice of medicine pursuant to section 325.15 of the Revised Code shall practice as an attorney at law during the period in which the coroner may not engage in the private practice of medicine.
No judge of any court of record in this state shall engage in the practice of law during the judge's term of office, either by appearing in court, by acting as advisory or consulting counsel for attorneys or others, by accepting employment or acting as an attorney, solicitor, collector, or legal advisor for any bank, corporation, or loan or trust company, or by otherwise engaging in the practice of law in this state, in or out of the courts, except as provided in section 1901.11 of the Revised Code.
A judge may complete any business undertaken by the judge in the United States district court, the United States circuit court of appeals, or the supreme court of the United States prior to the judge's election as judge.
R.C. §4705.01