Port Cornwall, also known as Fort Cornwall, is a former village in northern Alberta, Canada within the Municipal District of Lesser Slave River No. 124. Prior to incorporation as a village, the community was known as Mirror Landing. Port Cornwall was located on the north shore of the Lesser Slave River at its confluence with the Athabasca River. The Hamlet of Smith is located 1.4 km (0.87 mi) southeast of the former village across the Athabasca River.