Justice Day refers to William R. Day (1849–1923), associate justice of the Supreme Court of the United States. Justice Day may also refer to:
Arthur H. Day (1890–1967), associate justice of the Ohio Supreme Court Edward C. Day Jr. (1908–1999), associate justice of the Colorado Supreme Court George A. Day (1859–1927), associate justice of the Nebraska Supreme Court James G. Day (1835–1898), associate justice of the Iowa Supreme Court John Day (judge) (1797–1859), 2nd Chief Justice of Liberia L. B. Day (judge) (1889–1938), associate justice of the Nebraska Supreme Court Luther Day (1813–1885), associate justice of the Ohio Supreme Court Robert Day (Irish politician, born 1746) (1746–1841), justice of the Court of King's Bench of Ireland Robert H. Day (judge) (1867–1933), associate justice of the Ohio Supreme Court Roland B. Day (1919–2008), chief justice of the Wisconsin Supreme Court "Justice Day", a 2023 song by @onefive from Classy Crush
See also Sandra Day O'Connor (born Sandra Day, 1930), associate justice of the Supreme Court of the United States World Day of Social Justice World Day for International Justice Judge Day (disambiguation)