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
See also Bob Day (disambiguation)