Lake Ripley is a census-designated place (CDP), in the town of Oakland, Jefferson County, Wisconsin, United States.

As of the census[2] of 2000, there were 1,603 people, 656 households, and 444 families residing in the CDP.

There were 656 households, out of which 31.3% had children under the age of 18 living with them, 57.5% were married couples living together, 7.6% had a female householder with no husband present, and 32.3% were non-families.

25.5% of all households were made up of individuals, and 8.1% had someone living alone who was 65 years of age or older.

The lake produced Wisconsin's largest largemouth bass.