In geometry, a cuboid is a solid figure bounded by six rectangular faces. It can also be called a rectangular parallelepiped or rectangular prism. All angles of a cuboid are right angles and opposite faces of a cuboid are equal.

The square prism is a special case of the cuboid in which at least two faces are squares. The cube is a special case of the square prism in which all faces are squares.

If the dimensions of a cuboid are a, b and c, then its volume is abc and its surface area is 2ab + 2bc + 2ac.