Sir Kenneth Sydney Jacobs KBE QC (5 October 1917 – 24 May 2015) was an Australian judge who served as a Justice of the High Court of Australia.
He was educated at Knox Grammar School, and later studied at the University of Sydney, where he graduated with a Bachelor of Arts in 1938.
Later that year, Jacobs was admitted to the New South Wales Bar Association, where he practised as a barrister, and in 1958 he was made a Queen's Counsel.
He was selected by Prime Minister Gough Whitlam and Attorney-General Lionel Murphy, and was thus the first High Court Justice to be appointed by a Labor government since William Webb in 1946.
Murphy, who was himself appointed to the High Court the following year, praised Jacobs for humanitarianism and his excellent legal scholarship.