The mottled sculpin (Cottus bairdii) is a species of freshawater ray-finned fish belonging to the family Cottidae, the typical sculpins. This species has a wide but scattered North American distribution.

As the name suggests, its coloration is a combination of bars, spots, and speckles randomly distributed. The large pectoral fins are banded. The first dorsal fin is made of slender and somewhat soft spines, and just barely joins with the second dorsal. Maximum length is 15 cm.

Cottus bairdii. Retrieved May, 22 2023, from en.wikipedia.org/wiki/Mottled_sculpin.