The Alberta Liberal Party is a provincial political party in Alberta, Canada. Founded in 1905, it is the oldest active political party in Alberta and was the dominant political party until the 1921 election, with the first three provincial Premiers being Liberals. Since 1921, it has formed the official opposition in the Legislative Assembly of Alberta several times, most recently from 1993 until 2012. Fourteen Liberals have served as Leader of the Opposition of Alberta.

Alberta is one of the thirteen provinces and territories of Canada. It is a part of Western Canada and is one of the three prairie provinces. Alberta borders British Columbia to the west, Saskatchewan to the east, the Northwest Territories to the north, and the U.S. state of Montana to the south. It is one of the only two landlocked provinces in Canada, with Saskatchewan being the other. The eastern part of the province is occupied by the Great Plains, while the western part borders the Rocky Mountains. The province has a predominantly continental climate but experiences quick temperature changes due to air aridity. Seasonal temperature swings are less pronounced in western Alberta due to occasional Chinook winds.