Lord O'Neill may refer to:
- Baron O'Neill, a title in the Peerage of the United Kingdom created in 1868
- Viscount O'Neill, a title in the Peerage of Ireland created in 1795
- Earl O'Neill, a title in the Peerage of Ireland created in 1800
- Martin O'Neill, Baron O'Neill of Clackmannan (1945–2020), Scottish politician
- Jim O'Neill, Baron O'Neill of Gatley (born 1957), British economist
- Terence O'Neill, Baron O'Neill of the Maine (1914–1990), Prime Minister of Northern Ireland from 1963 to 1969
See also
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