Oroya Day MBE (née McAuley, 14 March 1931 – 26 August 2014) was a New Zealand art historian and academic, and was a lecturer at the Victoria University of Wellington.

[1] She attended St Mary's College in Wellington, and at the age of 21 married artist and art historian Melvin Day in Rotorua, against the wishes of her father.

[2] Day was a founding member and trustee of the Wellington Civic Trust in 1981, and founder and inaugural president of the Katherine Mansfield Birthplace Society, established in 1986.

[2] She is described as "the driving force" behind the society, and was responsible for the purchase and restoration of the house, Katherine Mansfield's childhood home.

[1] In the 1989 New Year Honours, Day was appointed a Member of the Most Excellent Order of the British Empire for services to the preservation of local history.