Hugh O'Neill, 1st Baron Rathcavan

Robert William Hugh O'Neill, 1st Baron Rathcavan, PC, PC (Ire), DL (8 June 1883 – 28 November 1982), known as Sir Hugh O'Neill, Bt, from 1929 to 1953, was an Ulster Unionist member of both the Parliament of the United Kingdom and the Parliament of Northern Ireland.

O'Neill was the third son of Edward O'Neill, 2nd Baron O'Neill, and the uncle of Terence O'Neill, Prime Minister of Northern Ireland. Educated at Eton College and New College, Oxford, Hugh O'Neill was subsequently called to the Bar at Inner Temple. He served as a Major in the British Army.

Although O'Neill contested the constituency of in 1906, he was first elected to the Westminster Parliament for Mid-Antrim in 1915, he later represented Antrim and then North Antrim.

O'Neill was also elected to represent Antrim in the Northern Ireland House of Commons in 1921 and served as its first Speaker, before standing down from his seat in 1929. The latter year he was created a Baronet, of Cleggan in the County of Antrim. In 1934, he was appointed High Sheriff of Antrim.

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