Bluefieldius Temporal range: Late Mississippian PreꞒ Ꞓ O S D C P T J K Pg N ↓
Holotype specimen
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Genus:	†Bluefieldius Mickle, 2018
Species:	†B. mercerensis
Binomial name
†Bluefieldius mercerensis Mickle, 2018

Bluefieldius is an extinct genus of marine ray-finned fish that lived during the Late Mississippian (Early Carboniferous) epoch in what is now West Virginia, United States.^[1] It is known from a single fossil collected from the late Serpukhovian or early Viséan Bluefield Formation.^[2] The type and only species (monotypy) is Bluefieldius mercerensis.

It has a "palaeoniscoid" body plan, although as that order is thought to be paraphyletic, it was described as an indeterminate actinopterygian.^[2]