在几何学中，双六角锥是指以六边形做为基底的双锥体，可以视为两个六角锥以底面些些组合成的多面体或一个六边形（不含内部）的每一个顶点向它所在的平面外一点与该点由平面镜射所产生的另外一个点依次连直线段而构成。所有双六角锥都有12个面，18个边和8个顶点。所有双六角锥都是十二面体。

双六角锥有时被称为dodecadeltahedron以区分其与正多面体——正十二面体（dodecahedron）的歧义。

A hexagonal bipyramid is a polyhedron formed from two hexagonal pyramids joined at their bases. The resulting solid has 12 triangular faces, 8 vertices and 18 edges. The 12 faces are identical isosceles triangles.

Although it is face-transitive, it is not a Platonic solid because some vertices have four faces meeting and others have six faces, and because its faces cannot be equilateral triangles.