Fontenelle is a census-designated place (CDP) in Lincoln County, Wyoming, United States.

It is named after the hamlet of Fontenelle, which is located in the southeast corner of the roughly-rectangular CDP.

As of the census[1] of 2000, there were 19 people, 5 households, and 5 families residing in the CDP.

No households were made up of individuals, and none had someone living alone who was 65 years of age or older.

There are 100.0% of families living below the poverty line and 100.0% of the population, including no under eighteens and none of those over 64.