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| References | Notes | Sign | |
| Radar |  |
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| Radian (abbreviation) | |
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| Radiation | |
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| Radical | |
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| Radius1 | |
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| Radius2 | |
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| Radius3 | |
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| Random1 | |
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| Range | |
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| Rank | |
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| Rare-earth | |
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| Rarefaction (in sound wave) | |
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| Rate | |
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| Ratio1 | |
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| Ratio2 | |
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| Rational | |
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| Ray (light) | |
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| Reactant | |
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| Reaction1 | |
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| Reactor | |
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| Reagent | |
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| Real number | |
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| Recessive | |
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| Reciprocal | |
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| Rectangle | |
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| Recycle2 | |
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| Recycle3 | |
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| Reduce1 | |
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| Reduce2 | |
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| Reduction (reaction) | |
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| Refer | |
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| Reference | |
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| Reference Point | |
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| Reflect | |
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| Reflection | |
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| Reflection(FS) | |
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| Reflex | |
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| Reflux | |
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| Refraction | |
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| Regular | |
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| Regulator | |
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| Relationship | |
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| Release | |
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| Reliability | |
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| Remainder1 | |
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| Repair | |
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| Repel | |
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| Replace1 | |
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| Report1 | |
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| Reproduce | |
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| Reptile | |
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| Repulsion | |
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| Research | |
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| Residual | |
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| Resistance1 | |
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| Resistance (symbol) | |
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| Resistor | |
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| Resonance | |
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| Resource | |
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| Respiration (fish) | |
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| Respiration (human) | |
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| Response1 | |
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| Response2 | |
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| Result | |
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| Resultant | |
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| Reverberation | |
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| Revolution (cyclic) | |
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| Revolve | |
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| Rhombus | |
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| Ribosome | |
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| Right angle | |
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| Right triangle | |
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| Robotics | |
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| Rock | |
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| Rocket | |
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| Root | |
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| Rotation (math) | |
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| Rotation (axis) | |
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| Rounding | |
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| Row (noun) | |
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