Frank Parker Day (9 May 1881 at Shubenacadie, Nova Scotia – 30 July 1950 at Yarmouth, Nova Scotia) was a Canadian athlete, academic and author.
Since Day's father was a Methodist minister who moved to a new congregation every three years, Day spent his youth living throughout Nova Scotia, living in Wallace, Acadia Mines, Mahone Bay, Boylston, and Lockeport.