Sir Thomas Mark Horner, PC (born 1956) is a Northern Irish barrister and judge. He has been a Lord Justice of Appeal for Northern Ireland since 2022.[1]
Horner was called to the Northern Irish bar in 1979 and became a Queen's Counsel in 1996. He was appointed to the High Court of Northern Ireland in 2012, receiving the customary knighthood.
He was sworn of the Privy Council in 2022.[2]
He is husband to Karin Horner and father to two children, Katie and Matthew.