William McGrath (1916–1992) was a loyalist from Northern Ireland.

William McGrath may also refer to:

• William L. McGrath (1894–1975), American business executive
• William Thomas McGrath (1918–1999), executive director of what is now the Canadian Criminal Justice Association
• Bill McGrath (William Desmond McGrath, 1936–2018), Australian politician and Australian rules footballer

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