奥沙华（英语：Oshawa）是加拿大安大略省南部杜林区一座城市，坐落安大略湖北岸，离多伦多市中心以东约60公里。据2011年加拿大人口普查所示，奥沙华市内人口为149,607；其都会区则包含邻近的惠特比镇和克拉灵顿自治区，2011年人口为356,177。奥沙华是杜林区内的最大城市，并是大多伦多地区以至金马蹄地区的东部重心。

奥沙华的经济多年来以汽车业为主；通用汽车加拿大分公司的总部设于市内，而奥沙华更有「加拿大汽车业之都」（Automotive Capital of Canada）的外号。

Oshawa (2011 population 149,607; CMA 356,177) is a city in Ontario, Canada, on the Lake Ontario shoreline. It lies in Southern Ontario approximately 60 kilometres east of downtown Toronto. It is commonly viewed as the eastern anchor of the Greater Toronto Area and of the Golden Horseshoe. It is the largest municipality in the Regional Municipality of Durham. The name Oshawa originates from the Ojibwa term aazhaway, meaning "the crossing place" or just "(a)cross".