William Monroe

William or Bill Monroe may refer to:


 * Bill Monroe (1911–1996), American bluegrass musician
 * Bill Monroe (1900s infielder) (c. 1877–1915), Negro league baseball player
 * Bill Monroe (1920s infielder), Negro league baseball player
 * Bill Monroe (journalist) (1920–2011), American journalist and NBC News correspondent
 * William Newton Monroe (fl. 1879–1881), founder of Monrovia, California
 * William Monroe, for whom William Monroe High School in Virginia was named in 1925
 * William T. Monroe, United States Ambassador to Bahrain in 2004–2007
 * William Monroe, character in the 2020 film Inheritance