Robert William Hugh O'Neill, 1st Baron Rathcavan,, known as Sir Hugh O'Neill, 1st Baronet, from 1929 to 1953, was an Ulster Unionist member of both the Parliament of the United Kingdom and the Parliament of Northern Ireland.
- Occupation
- politician, barrister
- Position held
- Member of the Privy Council of Ireland, Member of the Privy Council of the United Kingdom, member of the 40th Parliament of the United Kingdom, member of the 39th Parliament of the United Kingdom
- Citizenship
- United Kingdom, United Kingdom of Great Britain and Ireland
- Born
- June 8, 1883