William or Bill(y) McMullen may refer to:
- William McMullen (politician) (1888–1982), Irish trade unionist and politician
- Bill McMullen, American designer who created logo for mid-1990s Flux Television
- William Rodney McMullen (born 1960/1961), American business executive
- Billy McMullen (born 1980), American football player
This disambiguation page lists articles about people with the same name.
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