Leduc No. 1 was a major crude oil discovery made near Leduc, Alberta, Canada, on February 13, 1947. It provided the geological key to Alberta's most prolific conventional oil reserves and resulted in a boom in petroleum exploration and development across Western Canada. The discovery transformed the Alberta economy; oil and gas supplanted farming as the primary industry and resulted in the province becoming one of the richest in the country. Nationally, the discovery allowed Canada to become self-sufficient within a decade and ultimately a major exporter of oil.

Leduc is a city in the province of Alberta, Canada. It is 33 km (21 mi) south of the provincial capital of Edmonton and is part of the Edmonton Metropolitan Region.