Onalaska (/ˌɒnəˈlæskə/ ON-ə-LASS-kə)[3] is a town in La Crosse County, Wisconsin, United States.

The City of Onalaska borders the town, as does the village of Holmen.

The CDP of Brice Prairie is located in the western part of the Town of Onalaska.

As of the census[2] of 2000, there were 5,210 people, 1,777 households, and 1,503 families residing in the town.

11.4% of all households were made up of individuals, and 3.2% had someone living alone who was 65 years of age or older.