Desmond James Conrad Ackner, Baron Ackner, PC, QC (born September 18, 1920) is a Lord of Appeal in Ordinary, and for that reason he was created Baron Ackner in 1986.

Ackner was first educated at the Highgate School, before attending university at Clare College, Cambridge, from which he graduated with a Master of Arts. He was commissioned into the Royal Artillery and fought during World War II, before returning to England and being admitted into Middle Temple as a barrister. In 1961, he was invested a Queen's Counsel, a Bencher in 1965, and a High Court Judge of the Queen's Bench from 1971 to 1980. In 1980, he was appointed to the Privy Council, and became a Lord Justice of Appeal; three years later, he became an Honourary Fellow of the University of Cambridge. In 1986, he was appointed Lord of Appeal in Ordinary, earning the right to sit in the House of Lords.