Fontanelle is a city in Summerset Township, Adair County, Iowa, United States. The population was 676 at the time of the 2020 census.
thumb|upright|Fontanelle's [[water tower, on 5th Street]]
History
Fontanelle was platted in 1855, by New York state native James C. Gibbs (1820–1907), who followed the arrival of a transient named Collins. In the summer of that year, Gibbs purchased lots on the northeast of the city square where he constructed a large log cabin. He brought his family there to live. Gibbs ran a hotel out of the log cabin briefly.
D. M. Valentine purchased lots immediately to the west of Gibbs', thus becoming the second settler.
Geography
According to the United States Census Bureau, the city has a total area of , all land.
The town is located between the West fork and Main fork of the Middle Nodaway River along Iowa Highway 92.