Fidelma Nora Macken, SC (née O'Kelly; born 28 February 1942) is a retired Irish judge who served as a Judge of the Supreme Court from 2005 to 2012, a Judge of the High Court from 1998 to 1999 and between 2004 and 2005 and a Judge of the European Court of Justice from 1999 to 2004.^[1]

In 2004, she succeeded John L. Murray, as Ireland's appointee on the European Court of Justice (ECJ).^[2][3] Appointed initially for a five-year term, she was the first female appointee to the European Court of Justice but had her mandate renewed in 2003. She was reappointed a High Court judge on 18 October 2004 on her return to Ireland.^[4] In 2005, she was elevated the Supreme Court.^[4]

Macken was educated at King's Inns and Trinity College Dublin.^[1] She became a barrister in 1972; practiced as legal adviser, Patents and Trade Marks Agents (1973–1979) and became a Senior Counsel in 1995.

As a lawyer, she specialised on medical defence work and pharmaceutical actions.^{[citation needed]} She acted as defence counsel in a series of cases brought by children against whooping cough vaccine manufacturers for damage allegedly caused by the vaccine.^{[citation needed]} The Supreme Court nominated her to act in three referrals by the President of Ireland querying the constitutionality of new legislation before she became a judge.^{[citation needed]} In 2001, the Irish Times reported that she was an owner of the Four Seasons Hotel in Ballsbridge^[5]

She has been a lecturer in Legal Systems and Methods and Averil Deverell Lecturer in Law at Trinity College Dublin.^[1]

Macken returned to practice at Brick Court Chambers in 2013.^[6][7] She is a member of the Investment Advisory Panel of Woodsford Litigation Funding, a company engaged in litigation funding.^[8]

• List of members of the European Court of Justice