William Putnam may refer to:
- 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
- Bill Putnam (basketball) (1922–1992), American basketball player
- William Lowell Putnam III (1924–2014), alpinist, author and broadcasting executive
This disambiguation page lists articles about people with the same name.
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