William Hennessy may refer to:
- Bill Hennessy (Cork hurler) (1882–1954)
- Bill Hennessy (Kilkenny hurler) (born 1968)
- William Hennessy (violinist), Australian classical violinist
- William C. Hennessy, American civil servant and political figure
- William John Hennessy, Irish artist
- William Maunsell Hennessy, Irish official and scholar
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