In geometry of 4 dimensions, a **4-8 duoprism**, a duoprism and 4-polytope resulting from the Cartesian product of a square and a octagon.

It has 12 cells (4 octagonal prisms and 8 cubes), 44 faces (40 squares and 4 octagons), 64 edges, and 32 vertices.

The dual of a *4-8 duoprism* is called a **4-8 duopyramid**. It has 32 tetragonal disphenoid cells, 64 isosceles triangular faces, 44 edges, and 12 vertices.