Justice Mason may refer to:

• Anthony Mason (judge) (born 1925), chief justice of the High Court of Australia
• Charles Mason (Iowa judge) (1804–1882), chief justice of the Iowa Supreme Court
• Charles Mason (New York judge) (1810–1879), judge of the New York Court of Appeals
• Charles W. Mason (1887–1969), associate justice of the Oklahoma Supreme Court
• Henry F. Mason (1860–1927), associate justice of the Kansas Supreme Court
• John Thomson Mason Jr. (1815–1873), judge of the Maryland Court of Appeals
• John W. Mason (1842–1917), associate justice of the Supreme Court of Appeals of West Virginia
• M. L. Mason (1906–1990), associate justice of the Iowa Supreme Court
• Oliver P. Mason (1829–1891), associate justice of the Nebraska Supreme Court
• Thomson Mason (1733–1785), chief justice of the Supreme Court of Virginia