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Rho (upper case Ρ, lower case ρ) is the 17th letter of the Greek alphabet. In the system of Greek numerals it has a value of 100.

Rho is generally classed as a liquid (together with lambda and sometimes the nasals mu and nu), which has important implications for morphology. It is pronounced similarly to the letter r in languages with a Latin-derived alphabet.

Rho is used to designate a list of items in the APL programming language.

Letters that arose from rho include Roman R and Cyrillic Er.

Lower case ρ is used in physics to represent density and resistivity.

See also

• Rho - for other meanings.