Melvin Norman "Pat" Day[1] CNZM (30 June 1923 – 17 January 2016) was a New Zealand artist and art historian.

At the age of eleven, Day began Saturday morning classes at Elam School of Art, University of Auckland, under the tutelage of Archie Fisher, John Weeks, Lois White and Ida Eise.

A major survey exhibition, Melvin Day – Full Circle was shown at the Wellington City Art Gallery in 1984.

During 2007, Melvin Day collaborated with French writer Frédéric-Yves Jeannet and completed a series of work inspired by Vivaldi'sStabat Mater.

In 2009 Day, along with Nigel Brown, Geerda Leenards, and John Walsh travelled to Fiordland, to respond to the landscape which inspired Cook's artist William Hodges.

[3] An art historian, she was the founding president of the Katherine Mansfield Birthplace Society, and was appointed a Member of the Order of the British Empire, for services to the preservation of local history, in the 1989 New Year Honours.