James, Jim, or Jimmy Peacock may refer to:

• James Peacock (naval officer) (died 1653), English naval officer
• James Peacock (architect) (1735/1738–1814), English architect and surveyor
• Jim Peacock (footballer) (1871–after 1896), English footballer
• James Peacock (anthropologist) (born 1937), American anthropologist
• Jim Peacock (born 1937), Australian molecular biologist
• Jamie Peacock, English professional rugby league player