The Utah sucker (Catostomus ardens) is a species of freshwater fish in the family Catostomidae found in the upper Snake River and the Lake Bonneville areas of western North America where it lives in a wide range of habitats.

Recent genetic studies have revealed deep, but morphologically cryptic, population subdivision (about 4.5% sequence divergence) between drainages of the ancient Snake River and the Bonneville Basin.

It lives in a variety of habitats in its range, being found in lakes, rivers, and streams, in warm or cold water, and over substrates of silt, sand, gravel, or rocks, preferably in the vicinity of vegetation.

Some populations are in decline due to anthropogenic factors, including habitat destruction, water-flow diversion, migration barriers, chemical pollutants, and competition with exotic species.

In 1881, David Starr Jordan and Charles Henry Gilbert observed that this sucker "occurs in Utah Lake in numbers which are simply enormous"; the population seems to have boomed and crashed several times since then.