In geometry, the diminished rhombicosidodecahedron is one of the Johnson solids (). It can be constructed as a rhombicosidodecahedron with one pentagonal cupola removed.

Related Johnson solids are: : parabidiminished rhombicosidodecahedron with two opposing cupolae removed, and : metabidiminished rhombicosidodecahedron with two non-opposing cupolae removed, and : tridiminished rhombicosidodecahedron with three cupola removed.

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Editable printable net of a diminished rhombicosidodecahedron with interactive 3D view