Putnam or Puttnam is a surname. Notable people with the surnames include:
Adam Putnam (born 1974), American politicianAnn Putnam, Jr. (1679–1716), an accuser in the Salem witch trialsAshley Putnam (born 1952), American opera singerBenjamin A. Putnam (fl. 1810s), American soldier and politicianBrenda Putnam (1890–1975), American sculptorCalvin Richard Putnam (??–??), mathematicianCarleton Putnam (c. 1902 – 1998), American aviator, activist and authorCharles Flint Putnam (1854–1882), US naval officer, polar explorerDavid Putnam (1898–1918), American World War I air aceDavid Puttnam (born 1941), British film producerEdson A. Putnam (1832–1917), American politicianFrank W. Putnam (1917–2006), American biologistFrederic Ward Putnam (1839–1915), American anthropologist, Harvard UniversityGeorge Putnam (1914–2008), American journalistGeorge Haven Putnam (1844–1930), American book entrepreneur and publishing-family memberGeorge Palmer Putnam (1814–1872), American book entrepreneurGeorge P. Putnam (1887–1950), American publisher, author, explorer, and publishing-family and aviation-family memberHarvey Putnam (1793–1855), U.S. Congressman from New YorkHerbert Putnam (1861–1955), American library administrator and publishing-family memberHilary Putnam (1926–2016), American philosopherHoward Putnam (b. 1937), American travel business managerIsrael Putnam (1718–1790), American generalJames Putnam (disambiguation), several peopleMary Corinna Putnam Jacobi (1842–1906), American physicianMichael Putnam (born 1983), American professional golferPalmer Cosslett Putnam (1900–1984), American wind power pioneer and author, builder of the Smith-Putnam wind turbinePhelps Putnam (1894–1948), American poetRobert D. Putnam (born 1941), American political scientistRoger Putnam (1892–1972), American politician and industrialistRufus Putnam (1738–1824), American soldierSeth Putnam (1968–2011), American musicianThomas Putnam (1651–1699), landowner and accuser in Salem, Massachusetts, during the Salem witch trialsTracy Putnam (1894–1975), medical researcher, co-discoverer of PhenytoinWilliam LeBaron Putnam (1835–1918), American jurist and politicianWilliam Lowell Putnam (1861–1923), American jurist and banker