Catherine McGuinness (born 14 November 1934) is a retired judge and activist. She is a former barrister, Senator, President of the Law Reform Commission and judge of the Circuit Court, justice of the High Court and Supreme Court of Ireland. In January 2012 she was appointed to the Council of State by President Michael D. Higgins. In May 2013 she was appointed Chair of the National University of Ireland Galway Governing Authority.