John Putnam may refer to:

• John Putnam (comics), art director and designer of Mad magazine
• John Bishop Putnam, treasurer and director of the book publishing firm G.P. Putnam & Sons.
• John Day Putnam, member of the Wisconsin State Assembly
• J. Pickering Putnam, American architect and designer
• John Putnam (c. 1580–1666), founder of the colonial American Putnam family