In geometry, the stellated truncated hexahedron (or quasitruncated hexahedron) is a uniform star polyhedron, indexed as U19. It is represented by Schläfli symbol t{4/3,3}, and Coxeter-Dynkin diagram, . It is sometimes called quasitruncated hexahedron because it is related to the truncated cube, , except that the square faces become inverted into {8/3} octagrams.
Stellated truncated hexahedron is not a true stellation of the truncated hexahedron; its convex 'core' is not a uniform polyhedron.