Ontario Lottery and Gaming Corporation, known for corporate branding purposes simply as OLG since 2006, is a Crown corporation owned by the Government of Ontario, Canada. It is responsible for the province's lotteries, charity and Aboriginal casinos, commercial casinos, and slot machines at horse-racing tracks. It was created in April 2000 when the Ontario Lottery Corporation (OLC) was merged with the Ontario Casino Corporation (OCC), established in 1994. Prior to 2006, the combined entity was known in short form as the OLGC. OLG employs over 8,000 individuals throughout Ontario; 1,400 in Sault Ste Marie and the GTA offices. There are approximately 9,800 retailers operating more than 10,000 lottery terminals across the province.

Crown corporations in Canada are government organizations with a mixture of commercial and public-policy objectives. They are directly and wholly owned by the Crown.