In geometry, the **augmented triangular prism** is one of the Johnson solids (*J*_{49}). As the name suggests, it can be constructed by augmenting a triangular prism by attaching a square pyramid (*J*_{1}) to one of its equatorial faces. The resulting solid bears a superficial resemblance to the gyrobifastigium (*J*_{26}), the difference being that the latter is constructed by attaching a second triangular prism, rather than a square pyramid.

A Johnson solid is one of 92 strictly convex polyhedra that have regular faces but are not uniform (that is, they are not Platonic solids, Archimedean solids, prisms or antiprisms). They were named by Norman Johnson, who first listed these polyhedra in 1966.