Brian Francis Kerr, Baron Kerr of Tonaghmore, PC (/kɜːr/; 22 February 1948 – 1 December 2020) was a Northern Irish barrister and a senior judge who was Lord Chief Justice of Northern Ireland and then a Justice of the Supreme Court of the United Kingdom. At the time of his retirement, he was the longest serving Supreme Court Justice, and the last original member of the Court.