John Merrill

• John Merrill (marathon walker), British sportsman
• John Merrill (Medal of Honor), awarded the U.S. Medal of Honor, 1879
• John Merrill (American politician), American politician from Alabama
• John O. Merrill, American architect and structural engineer
• John P. Merrill, American physician, researcher and Harvard professor
• John C. Merrill, American professor
• John Merrill (MP), British government official and politician