Lord O'Neill

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