Justice Duncan or Judge Duncan, may refer to:

• Laurence Ilsley Duncan (1906–1982), associate justice of the New Hampshire Supreme Court
• Rebecca Duncan (born 1971), associate justice of the Oregon Supreme Court
• Robert Morton Duncan (1927–2012), associate justice of the Ohio Supreme Court
• Warren W. Duncan (1857–1938), associate justice of the Illinois Supreme Court

• Benjamin Faneuil Dunkin, chief justice of the South Carolina Supreme Court
• Judge Duncan (disambiguation)

This disambiguation page lists articles associated with the title Justice Duncan.
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