在几何学中，十四面体是指由十四个平面组成的多面体，而每个面都是正多边形的十四面体称为半正十四面体。

半正十四面体并不唯一，不像半正五面体、半正七面体只有一个，半正十四面体有四个，分别是截半立方体、截角立方体、截角八面体和正十二角柱。

除了半正十四面体之外，十四面体可以是十三角锥、双七角锥、七方偏方面体、正三角帐塔柱、同相双三角帐塔、三侧锥三角柱、截角六方偏方面体、侧帐塔截角四面体、Császár polyhedron等多面体。

A tetradecahedron is a polyhedron with 14 faces. There are numerous topologically distinct forms of a tetradecahedron, with many constructible entirely with regular polygon faces.

A tetradecahedron is sometimes called a tetrakaidecahedron. No difference in meaning is ascribed. The Greek word kai means 'and'.