Quietula is a genus of fish in the goby subfamily, Gobionellinae.

There are two species, both native to the Gulf of California in Mexico.

[1] The genus name Quietula is from the Latin quietus, meaning "quiet".

[2] These gobies have elongated bodies and compressed heads with large eyes and large mouths, with the corner of the mouth located posterior to the eye.

Q. guaymasiae and Q. y-cauda can be distinguished by the shape of the dark spot on the caudal fin; the former has a transverse marking at the base of the fin, while the latter has a sideways y-shaped spot that extends forward onto the caudal peduncle.