In geometry, the great icosicosidodecahedron (or great icosified icosidodecahedron) is a nonconvex uniform polyhedron, indexed as U₄₈. It has 52 faces (20 triangles, 12 pentagrams, and 20 hexagons), 120 edges, and 60 vertices.^[1] Its vertex figure is a crossed quadrilateral.

Great icosicosidodecahedron
Type	Uniform star polyhedron
Elements	F = 52, E = 120 V = 60 (χ = −8)
Faces by sides	20{3}+12{5}+20{6}
Coxeter diagram
Wythoff symbol	3/2 5 | 3 3 5/4 | 3
Symmetry group	Ih, [5,3], *532
Index references	U48, C62, W88
Dual polyhedron	Great icosacronic hexecontahedron
Vertex figure	5.6.3/2.6
Bowers acronym	Giid

It shares its vertex arrangement with the truncated dodecahedron. It additionally shares its edge arrangement with the great ditrigonal dodecicosidodecahedron (having the triangular and pentagonal faces in common) and the great dodecicosahedron (having the hexagonal faces in common).

Truncated dodecahedron

Great icosicosidodecahedron

Great ditrigonal dodecicosidodecahedron

Great dodecicosahedron