The chameleon goby (Tridentiger trigonocephalus) is a species of ray-finned fish native to marine and brackish waters along the coasts of eastern Asia.

[5] The chameleon goby is native to the eastern coast of Asia where its range includes Japan, Korea, China and Siberia.

[6][7] It is a demersal fish, living and feeding near the seabed, both in bays and rocky coasts, in brackish water and freshwater lakes.

[4] The chameleon goby was first detected in Los Angeles harbor in 1960 and was later found at other locations in California including Redwood City docks, the tidal lagoon of Lake Merritt in Oakland and San Diego Bay.

Possible means of introduction include being transported in a ship's ballast water, as a result of the commercial trade in Pacific oysters, or as eggs among the fouling organisms on the hull of a vessel.