Gigantopterus ("giant wing") is an extinct genus of prehistoric marine ray-finned fish that lived around what is now Europe during the Late Triassic epoch. A single species is known, G. telleri from the Carnian-aged Reingrabener Schiefer of Austria. Like its close relative Thoracopterus, it had convergently evolved large pectoral fins reminiscent of modern flying fish. Tintori & Sassi (1992) suggested that it may be synonymous with Thoracopterus, but Shen & Arratia (2021) reaffirmed it as being a distinct genus.