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

• Bob Day (disambiguation)

This disambiguation page lists articles about people with the same name.
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