The common goby (Pomatoschistus microps) is a species of ray-finned fish native to fresh and brackish waters along the Atlantic and Baltic Sea coasts of Europe and northern Africa, with a range stretching from Norway to Morocco and Mauritania.

The common goby has two dorsal fins with a narrow gap between them, the anterior one consisting of six to eight spines and the posterior one eight to eleven soft rays.

The average size is about 4 to 5 cm (1.6 to 2.0 in)[2] with a maximum of about 9 cm (3.5 in)[3] The common goby breeds from February to September, laying its eggs under shells, stones or on aquatic plants.

They inhabit sandy- or muddy-bottomed shallow areas in estuaries or brackish lagoons at depths of from 0 to 12 metres (0 to 39 ft).

Their diet is mostly small crustaceans, worms, harpacticoids, amphipods, chironomid larvae and mites.