Fistularioides is an extinct genus of prehistoric bony fish that lived from the early to middle Eocene. It usually didn't exceed 25 centimeters in length. Fistularioides belongs to the syngnathiforms.
Fistularioides was an unusual fish with a slender and thin body. Its tubular body was shaped like a whip. The head was narrow and long, with small eyes and an extremely long snout. It also had a small mouth. It had a forked caudal fin.
Fistularioides has been assigned to the family Fistularioididae, along with its fellow genus, Pseudosyngnathus.