Ohio Revised Code Title I. State Government § 101.25

During a regular session of the general assembly, a senator who desires to resign shall do so by presenting a letter of resignation to the president of the senate and a representative who desires to resign shall do so by presenting a letter of resignation to the speaker of the house of representatives. The president or speaker shall verify authenticity of the letter of resignation and, upon doing so, shall send a letter of acknowledgment to the resigning senator or representative.

When the general assembly has adjourned its regular session sine die, a senator or representative who desires to resign shall do so by presenting a letter of resignation to the governor. The governor shall verify authenticity of the letter of resignation and, upon doing so, shall send a letter of acknowledgement to the resigning senator or representative.

An acknowledged resignation takes effect at the time specified in the letter of resignation. If an acknowledged resignation occurs during a regular session of the general assembly, the clerk of the senate or clerk of the house of representatives shall spread the letter of resignation upon the senate or house of representatives journal.

This section does not apply to a member-elect who resigns before the general assembly has organized.