William Putnam is the name of:

• William LeBaron Putnam (1835–1918), Maine lawyer and politician and United States federal judge
• William Lowell Putnam (1861–1923), American lawyer and banker
• Bill Putnam (1920–1989), American audio engineer
• William Lowell Putnam III (1924–2014), alpinist, author and broadcasting executive
• William Putnam M'Cabe
• Bill Putnam (sports executive), founding owner of the Philadelphia Flyers

• Metalloproteinases in Medicine
• Metallosphaera cuprina
• Metallosphaera hakonensis
• Metallosphaera prunae
• Metallosphaera sedula
• Metallosphaera yellowstonensis
• Metallothioneins
• Metallothionin
• Metallothionins
• Metallum
• Metallum Nostrum
• Metallurg Anosov
• Metallurg Anosov (ship, 1962)
• Metallurg Bratsk
• Metallurgical and Materials Engineering
• Metallurgical and Materials Transactions B
• Metallurgical and Materials Transactions E
• Metallurgical assayer
• Metallurgical coal
• Metallurgical Corporation of China Limited
• Metallurgical Engineer
• Metallurgical & Engineering Consultant
• Metallurgical & Engineering Consultant Ltd Sail Stadium
• Metallurgical & Materials Engineering
• Metallurgical & Materials Transactions