In geometry, the tridiminished rhombicosidodecahedron is one of the Johnson solids (J_83). It can be constructed as a rhombicosidodecahedron with three pentagonal cupolae removed. Related Johnson solids are: J_76: diminished rhombicosidodecahedron with one cupola removed, J_80: parabidiminished rhombicosidodecahedron with two opposing cupolae removed, and J_81: metabidiminished rhombicosidodecahedron with two non-opposing cupolae removed.