Caswell is a surname. Notable people with the surname include:
Albert Edward Caswell (1884–1954), American physicist and educator Alexis Caswell (1799–1877), American mathematician, scientist and educator Allan Caswell (born 1952), Australian songwriter Berengera Caswell (1828–1849), Canadian mill and factory worker Bill Caswell, American country music singer, songwriter and musician Brian Caswell (born 1954), Australian author Brian Caswell (footballer) (born 1956), English footballer Bruce Caswell (born 1949), American politician Burr Caswell (1807–1896), American frontiersman Chris Caswell, musician Eddie Caswell, Welsh rugby player in the 1920s and coach in the 1930s and 1940s Edward S. Caswell (1861–1938), Canadian publisher and editor Emil George Henry Caswell (1854–?), Anglican clergyman Gay Caswell (born 1948), Canadian writer and politician G. N. Caswell (1818 cricketer), English cricketer Hollis Caswell (1901–1988), American educator John Caswell (1654 or 1655–1712), English mathematician and Oxford professor of astronomy Lucien B. Caswell (1827–1919), American politician Luke Caswell, better known as Cazwell, a gay American rapper Oliver A. Caswell, member of the Wisconsin State Assembly in 1872 Peter Caswell (born 1957), English football goalkeeper Richard Caswell (1729–1789), first and fifth governor of North Carolina Robert Caswell (1946–2006), Australian screenwriter Samuel Bradford Caswell (1828–1898), American mining engineer, judge and Los Angeles government official Sarah Heritage Caswell (1740–1794), American political hostess William Caswell (1754–1785), American politician William E. Caswell (1947–2001), American physicist