Elongated Pentagonal Dipyramid
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Johnson Solid 
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- Reversion of Series
- Reznik's Identity
- Rhodonea
- Rhomb
- Rhombic Dodecahedral Number
- Rhombic Dodecahedron
- Rhombic Icosahedron
- Rhombicosacron
- Rhombicosahedron
- Rhombicosidodecahedron
- Rhombic Polyhedron
- Rhombic Triacontahedron
- Rhombicuboctahedron
- Rhombidodecadodecahedron
- Rhombihexacron
- Rhombihexahedron
- Rhombitruncated Cuboctahedron
- Rhombitruncated Icosidodecahedron
- Rhombohedron
- Rhomboid
- Rhomboidal Dodecahedron
- Rhombus
- Rhumb Line
- Ribbon Knot
- Ribet's Theorem