Waterloo—Wellington was a federal electoral district represented in the House of Commons of Canada from 1997 to 2003.

It continued to be a provincial electoral district represented in the Legislative Assembly of Ontario until the 2007 provincial election.

It was abolished in 2003, and divided between Cambridge, Kitchener—Conestoga, Perth Wellington and Wellington—Halton Hills ridings.

Waterloo—Wellington consisted of the southwest part of the City of Kitchener, the townships of Wilmot, Wellesley and Woolwich, the northwest part of the County of Wellington excluding the Village of Arthur, the Town of Mount Forest, and the Township of West Luther.

This riding has elected the following members of Parliament: