Bill Allen may refer to:
- Bill Allen (footballer) (1889–1948), Australian footballer and cricketer
- William McPherson Allen (1900–1985), CEO of Boeing
- Bill Allen (British politician) (1901–1973), MP for West Belfast
- Bill "Hoss" Allen (1922–1997), American radio disc jockey
- Bill Allen (businessman, born 1937) (1937–2022), American corporate executive and political financier
- Bill Allen (dentist) (born 1943), English dentist
- Bill Allen (basketball) (born 1945), American basketball player
- Bill Allen (Canadian politician) (born 1946), politician from Saskatchewan, Canada
- Bill Allen (Missouri politician), member of the Missouri House of Representatives
- Bill Allen (actor) (born 1962), American film and television actor