The Kern River rainbow trout (Oncorhynchus mykiss gilberti) is a localized subspecies of the rainbow trout (Oncorhynchus mykiss), a variety of fish in the family Salmonidae.

It is found in a short section of the main stem of the Kern River and several tributaries in the southern Sierra Nevada in California.

Its historic range in the main stem of the Kern River it probably extended downstream below where Isabella Dam is today and upstream in the South Fork of the Kern River as far as Onyx creek.

[7][8] The subspecies has been extirpated in the Kern river from the Johnsondale bridge downstream.

[3] Recent genetic analyses however suggest that some un-hybridized populations still exist.