Fieldon is a village in Jersey County, Illinois, United States. As of the 2010 census, the village had a total population of 239. The village's current mayor is Betty Duggan.
Fieldon is located at 39°6′29″N 90°30′0″W / 39.10806°N 90.5°W / 39.10806; -90.5 (39.108184, -90.500048).
According to the United States Census Bureau, the village has a total area of 0.2 square miles (0.5 km²). None of it is covered by water.