Etheostoma exile, the Iowa darter, is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is native to the lakes and streams of Iowa, along with about 17 other species of darters.

In some parts of its range, the Iowa darter is also known as the weed darter, red-sided darter, or yellowbelly. Iowa darters, like many other darters, are about 2–3 in (51–76 mm) in length and may be easily confused with other darters of similar color.

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