Oak Ridges—Markham is a provincial electoral district in Ontario, Canada, that has been represented in the Legislative Assembly of Ontario since the 2007 provincial election. Its population in 2006 was 169,645, with 136,755 electors, the highest of any riding in Ontario. It is the fastest growing riding in the province, having experienced a 52.5% increase in population from 2001 to 2006.

The district covers part of the suburbs north of Toronto. It includes the town of Whitchurch–Stouffville, most of the township of King (excepting extreme northeast) the northern portions of the town of Richmond Hill (including all of Oak Ridges), and the northern and eastern portions of the city of Markham.

The electoral district was created in 2004 52.5% from Oak Ridges, 30% from Markham, 13% from Vaughan—King—Aurora district and 4.5% from York North riding.

In 2018, the district will be dissolved into Markham—Stouffville, King—Vaughan, Markham—Unionville and Aurora—Oak Ridges—Richmond Hill.

Communities in Oak Ridges—Markham are the destination for many immigrants to Canada, composing about 41.6% of the population, or about 70,000 of its residents. For 72,440 residents, neither English nor French, the official languages of Canada, is their mother tongue, though most have knowledge of English (148,975), French (160), or both (12,885). Most immigrants become citizens, as 11,155 immigrants were not Canadian citizens as of the Canada 2006 Census.

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