Justice Gray refers to Horace Gray, associate justice of the Massachusetts Supreme Judicial Court, and of the United States Supreme Court.

Justice Gray may also refer to:

• John Clinton Gray (1843–1915), judge of the New York Court of Appeals
• Karla M. Gray (1947–2017), chief justice of the Montana Supreme Court
• Peter W. Gray (1819–1874), associate justice of the Texas Supreme Court
• Hiram Gray (1801–1890), ex officio a judge of the New York Court of Appeals
• Pardon Gray (1737–1814), associate justice of the Rhode Island Supreme Court