Otto Warburg may refer to:

• Otto Warburg (botanist) (1859–1938), German botanist
• Otto Heinrich Warburg (1883–1970), German physiologist

• John McLeod (British Army officer)
• John McLeod (Canada West politician)
• John McLeod (disambiguation)
• John McLeod (New Brunswick politician)
• John McLeod (New Zealand politician)
• John McLeod (politician)
• John McLeod (songwriter)
• John McLoughlin (disambiguation)
• John McLoughlin House
• John McLucas
• John McLure Hamilton
• John McMahon (Australian politician)
• John McMahon (disambiguation)
• John McMahon House
• John McMahon (Surrey and Somerset cricketer)
• John McMahon (wrestler)
• John McMakin (baseball)
• John McManus (disambiguation)
• John McManus (New Zealand politician)
• John McMartin (Canadian politician)
• John McMaster (mayor)
• John McMillan (Alabama leader)
• John McMillan (Alabama politican)
• John McMillan (Alabama politician)
• John McMillan (disambiguation)