Michael Patrick Donnelly (born August 30, 1966) is an American lawyer who served as a justice of the Supreme Court of Ohio from 2019 to 2024.
In 2024, Donnelly lost re-election to his seat to Hamilton County Court of Common Pleas judge Megan E. Shanahan.
He also has been a faculty member of the Ohio Judicial College, teaching both attorneys and judges at numerous continuing-legal-education seminars on professionalism and issues of civil and criminal justice reform.
[4] On January 3, 2018, Donnelly announced his candidacy as a justice of the Ohio Supreme Court, seeking to replace Terrence O'Donnell, who reached the mandatory retirement age.
[6][7] During his tenure, Donnelly has written several notable dissents, including in a case involving the state takeover of Youngstown City Schools.