R-value or rvalue may refer to:
- In computer science, a value considered independently of its storage location
- [In computer science]Data value of a variable stored at some location in memory.
- R-value (insulation) in building engineering, the efficiency of insulation of a house
- R-value (soils) in geotechnical engineering, the stability of soils and aggregates for pavement construction
- R-factor (crystallography), a measure of the agreement between the crystallographic model and the diffraction data
- In statistics, the Pearson product-moment correlation coefficient, or simply correlation coefficient
- In ophthalmic optics, the distance between the segment optical center and the segment top
- In solid mechanics, the Lankford coefficient
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