In geometry, an n-sided prism is a polyhedron made of an n-sided polygonal base, a translated copy, and n faces joining corresponding sides. Thus these joining faces are parallelograms. All cross-sections parallel to the base faces are the same.

A prism is a subclass of the prismatoids. A right prism is a prism in which the joining edges and faces are perpendicular to the base faces. This applies if the joining faces are rectangular.

If the joining edges and faces are not perpendicular to the base faces, it is called an oblique prism. Some texts may use the term rectangular or square prism to talk about both a right rectangular-sided prism and a right square-sided prism.

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