Bly is a surname. Notable people with the surname include:
Beldon Bly (1914–2006), American teacher and politician Billy Bly (1920–1982), English professional football goalkeeper Carol Bly (1930–2007), short story writer David Bly (born 1952), American politician Dré Bly (born 1977), American football coach and player John Bly (born 1939), English antiques specialist Jordan Bly (born 2002), American football player Mark Bly (born 1949), American dramaturge, educator, and author Mary Bly (born 1962), author who publishes under the name Eloisa James Nellie Bly, pen name of Elizabeth Cochrane Seaman (1864–1922), American journalist, author, industrialist, and charity worker Robert Bly (1926–2021), author of Iron John (book) Robert W. Bly (born 1957), American writer Stephen Bly (1944–2011), American author and politician Terry Bly (1935–2009), footballer who played for Norwich City and Peterborough United
In fiction John Bly, the main antagonist in The Adventures of Brisco County, Jr. television series
See also Bligh (disambiguation)