William Trench may refer to:

• William Trench, 1st Earl of Clancarty (1741-1805), Anglo-Irish aristocrat and politician
• William Trench, 3rd Earl of Clancarty (1803-1872), Irish nobleman
• William Trench III (1831-1896), reeve of Richmond Hill, Ontario
• William Le Poer Trench (1837-1920), Anglo-Irish politician and British army officer

• Dotted quad
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• Doty, Wisconsin
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