The arroyo chub (Gila orcuttii) is a species of cyprinid fish found only in the coastal streams of southern California, United States.

Arroyo chub habitat is primarily the warm streams of the Los Angeles Plain, which are typically muddy torrents during the winter, and clear quiet brooks in the summer, possibly drying up in places.

It has been found in the Los Angeles River (Sepulveda Dam Basin) as recently as 1978.

The Mojave and Cuyama River populations extend into the ranges of related fishes, and hybridize with Mojave chub and California roach, respectively.The fish can be found in several watersheds in the southern California region including the Ventura Watersheds to as southernmost as the San Diego Watershed[2]s. The species epithet was chosen in honor of Charles Russell Orcutt, who made the first collection of this fish in 1889, improvising by using a blanket as a seine.

It is often misspelled as orcutti, although this is still considered a valid synonym, and is for instance used by Moyle in his book.