John P. O'Donnell is a judge of the Cuyahoga County Court of Common Pleas in Ohio.

O'Donnell is running for election for judge of the Ohio Supreme Court. He is on the ballot in the Democratic primary on March 17, 2020.

O'Donnell is a Democratic judge of the Cuyahoga County Court of Common Pleas. O'Donnell joined the court in 2007 and was re-elected in 2012. He previously served on the court from 2002 to 2005.

O'Donnell received his undergraduate degree from Miami University (of Ohio) in 1987 and his J.D. from the Cleveland-Marshall College of Law in 1993.