William McCullough may refer to:
- William McCullough (loyalist) (1949–1981), Northern Irish loyalist paramilitary with the Ulster Defence Association
- William McCullough (Northern Ireland politician) (1901-1967), Northern Irish communist and trade unionist
- William McCullough (New Zealand politician) (1843–1925), New Zealand politician
- Billy McCullough (born 1935), Northern Irish footballer
This disambiguation page lists articles about people with the same name.
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