Lousana is a hamlet in central Alberta, Canada within Red Deer County. It is located east of the junction of Highway 21 and Highway 42, approximately southeast of Red Deer. The hamlet was named by William Henry Biggs, a settler from Louisiana, Missouri, who sold a portion of his land to the Grand Trunk Pacific Railway around 1912 for the townsite. Biggs originally proposed naming the settlement "Louisiana" after his hometown. However, the Post Office Department shortened it to Lousana to avoid confusion with the U.S. state of Louisiana.
In the 2021 Census of Population conducted by Statistics Canada, Lousana had a population of 42 living in 22 of its 30 total private dwellings, a change of from its 2016 population of 58. With a land area of , it had a population density of in 2021.
As a designated place in the 2016 Census of Population conducted by Statistics Canada, Lousana had a population of 58 living in 23 of its 28 total private dwellings, a change of from its 2011 population of 46. With a land area of , it had a population density of in 2016.