William Putnam

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