Scarborough West was a provincial electoral district in Ontario, Canada. It was created prior to the 1963 provincial election and eliminated in 1996, when its territory was incorporated into the riding of Scarborough Southwest. Scarborough West riding was created from part of the former riding of York—Scarborough. It was in the former borough of Scarborough. Four Members of Provincial Parliament represented the riding during its history. The most notable was Stephen Lewis who was leader of the New Democratic Party of Ontario from 1970-1978.