Joseph Day may refer to:
Joe Day (ice hockey) (born 1968), American ice hockey center Joe Day (footballer) (born 1990), English football goalkeeper Joseph Day (inventor) (1855–1946), inventor of the modern two-stroke engine Joseph A. Day (born 1945), Canadian senator Joseph P. Day (1874–1944), American real estate entrepreneur Joseph Day (Massachusetts politician), representative to the Great and General Court
See also Joseph Daye (born 1990), Australian rule footballer