Robert Day

Robert Day may refer to:
 * Robert Day (antiquarian) (1836–1914), Irish antiquarian and photographer
 * Robert Day (Australian politician) (1886–1968), New South Wales politician
 * Robert H. Day (judge) (1867–1933), lawyer and judge in Ohio
 * Robert H. Day (soldier) (1835–1929), Union officer, railroad engineer and electrical engineer
 * Robert Day (Irish politician, born 1746) (1746–1841), Irish politician, barrister and judge
 * Robert Day (Irish politician, born 1884) (1884–1949), Irish Labour Party politician from Cork
 * Robert Day (cartoonist) (1900–1985), American cartoonist
 * Robert L. Day (1920–1999), mayor of Boise, Idaho
 * Robert Day (director) (1922–2017), English film director
 * Robert Day (footballer) (born 1944), former Australian rules footballer
 * Robert Addison Day (1943–2023), businessman
 * Robert Day (basketball) (born 1982), American basketball player