Robert John Day (born 5 July 1952) is an Australian former politician and businessman who was a Senator for South Australia from 1 July 2014 to 1 November 2016. He is a former federal chairman of the Family First Party. Before entering politics, he worked in the housing industry, owning several businesses, and at one stage serving as president of the Housing Industry Association.Day was the Liberal Party's candidate for the federal seat of Makin at the 2007 election, but resigned from the party after failing to gain preselection for the 2008 Mayo by-election. He subsequently joined the Family First Party and was their candidate for the by-election, later becoming their lead Senate candidate in South Australia at the 2010 election and 2013 election.
