The Member of Parliament for Wellington—Halton Hills is Michael Chong of the Conservative Party of Canada.

It consists of the Town of Halton Hills in the Regional Municipality of Halton and the townships of Centre Wellington, Guelph/Eramosa and Puslinch and the Town of Erin in Wellington County.

This riding lost fractions of territory to Guelph and Kitchener—Conestoga during the 2012 electoral redistribution.

Under the 2022 Canadian federal electoral redistribution the riding will be replaced by Milton East—Halton Hills South and Wellington—Halton Hills North.

[3] According to the 2021 Canadian census[7] Ethnic groups: 86.8% White, 4.4% South Asian, 2.6% Indigenous, 1.5% Black Languages: 84.6% English, 1.2% French, 1.2% Polish, 1.1% Punjabi, 1.1% Portuguese Religions: 59.6% Christian (27.9% Catholic, 6.2% United Church, 5.4% Anglican, 3.3% Presbyterian, 1.2% Christian Orthodox, 1.1% Baptist, 1.1% Reformed, 13.4% Other), 1.6% Sikh, 1.5% Muslim, 1.1% Hindu, 35.3% None