- Rho (upper case Ρ, lower case ρ) is a letter of the Greek alphabet. See Rho (letter).
- The lower-case letter ρ is used as the symbol for the radius in a polar coordinate system in mathematics.
- The lower-case letter ρ is used as the symbol for the density of a material in physics.
- The lower-case letter ρ is used as the symbol for the resistivity of a material in physics.
- The lower-case letter ρ is used as the symbol for the Rho factor protein in RNA transcription termination.
Rho is also the name of a town near Milan, in Italy
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