William Hepburn Cozens-Hardy, 2nd Baron Cozens-Hardy (25 March 1869 – 25 May 1924) was a British Liberal politician and lawyer.
Cozens-Hardy was the eldest son of Herbert Cozens-Hardy, 1st Baron Cozens-Hardy and Maria Hepburn. Herbert Cozens-Hardy was a lawyer and Liberal Member of Parliament for North Norfolk from 1885-99. He was then appointed a judge and eventually became Master of the Rolls. The Barony was created in 1914 and William succeeded as 2nd Baron on the death of his father in 1920. In 1895, he married Gertrude Lilian the eldest daughter of Colonel Sir William Everett KCMG. They had one daughter.
William was educated at University College School in Hampstead where he was leader of the school debating society and Captain of School. He then went up to New College, Oxford where he took his degree with classical honours.
Like his father, William went into the law. He was called to the Bar at Lincoln’s Inn in 1893 and took silk in 1912. He was made a Bencher of Lincoln’s Inn in 1916. He also sat as a Justice of the Peace in Norfolk. In 1913 he was offered the post of Chief Justice of Bengal but refused for private reasons. Throughout the four years of the First World War, he was a Commander in the Royal Naval Volunteer Reserve, serving on the Admiralty War Staff, attached to the Intelligence Department. He was awarded the Italian Order of St Maurice and St Lazarus. He was knighted in 1912.