Jack Hennessy may refer to:

• John Francis Hennessy (1853–1924), Australian architect
• John Francis (Jack) Hennessy (1887–1955), his son, Australian architect
• John M. Hennessy, American financier and philanthropist
• Jack Hennessy (politician) (1951–2024), member of the Connecticut House of Representatives

• Jackie Hennessy, Irish footballer

Topics referred to by the same term

This disambiguation page lists articles about people with the same name.
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