在几何学中，三角化八面体是一种卡塔兰多面体，其为截角立方体的对偶多面体。

三角化八面体是菱形（正方形倾斜四十五度）四边各加一个等腰三角形拼成的正八边形在立体几何中的推广。

一个最短边长为1的三角化八面体，它的表面积为，体积为。

In geometry, a triakis octahedron (or kisoctahedron) is an Archimedean dual solid, or a Catalan solid. Its dual is the truncated cube.

It can be seen as an octahedron with triangular pyramids added to each face; that is, it is the Kleetope of the octahedron. It is also sometimes called a trisoctahedron, or, more fully, trigonal trisoctahedron. Both names reflect the fact that it has three triangular faces for every face of an octahedron. The tetragonal trisoctahedron is another name for the deltoidal icositetrahedron, a different polyhedron with three quadrilateral faces for every face of an octahedron.