Wellington South was a Canadian federal electoral district represented in the House of Commons of Canada from 1867 to 1968. It was located in the province of Ontario. It was created by the British North America Act of 1867 as the "South Riding of the county of Wellington". The County of Wellington was divided into three ridings: the North, South and Centre Ridings". The South Riding initially consisted of the Town of Guelph, and the Townships of Guelph and Puslinch. In 1872, the Townships of Eramosa and Erin were added to the riding.