Whitby—Oshawa was a provincial electoral district in Ontario, Canada, that was represented in the Legislative Assembly of Ontario from the 2007 provincial election until 2018. The riding was adjusted by the 2015 Representation Act for the 2018 provincial election,^[2] losing some territory to the district of Oshawa,^[3] and replaced as the district of Whitby.

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Whitby—Oshawa

Ontario electoral district
Whitby—Oshawa in relation to other Greater Toronto ridings
Defunct provincial electoral district
Legislature	Legislative Assembly of Ontario
District created	2006
District abolished	2018
First contested	2011
Last contested	2016-by
Demographics
Population (2011)	146,307
Electors (2014)	110,398[1]
Area (km²)	234
Census division(s)	Durham
Census subdivision(s)	Whitby, Oshawa

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The riding was created in 2003 and consists of 68 percent of the Whitby—Ajax district, 20 percent of the Oshawa district and three percent of the Durham.^[4] The provincial electoral district was created from the same ridings in 2007.

It consists of the Town of Whitby and northwestern section of the City of Oshawa (specifically, the portion of the city lying north and west of a line drawn from the western city limit east along King Street West, north along the Oshawa Creek, east along Rossland Road West, north along Simcoe Street North, and east along Winchester Road East to the eastern city limit).

For the 2018 election, Whitby-Oshawa was re-districted as Whitby to more closely correspond to the actual town's borders.

According to the 2011 Canadian census

• Population: 146,307
• Ethnic Groups: 81.4% White, 5.5% Black, 4.3% South Asian, 1.7% Chinese, 1.7% Filipino, 1.4% Aboriginal
• Languages: 85.3% English, 2.1% French, 1.5% Italian, 1.1% Chinese
• Religion: 71.2% Christian (32.6% Catholic, 10.3% United Church, 8.3% Anglican, 2.6% Presbyterian, 2.4% Christian Orthodox, 2.1% Baptist, 10.4% Other Christian), 2.6% Muslim, 1.4% Hindu, 23.6% No religion.
• Average household income: $104,969
• Median household income: $89,608
• Average individual income: $48,444
• Median individual income: $37,099

^ Change is from redistributed results.