Ru

Ru, ru, or RU may refer to:
* Rù (入), the entering tone in Chinese language phonetics
* Rú (儒), Chinese language term for Confucianism
* Ru (kana), romanisation of the Japanese kana る and ル ; the same letters are used to substitute an L preceeding a consonant when transliterating latin script words to Katakana.

* Rack unit
* Rugby union

* Chemical symbol for the element ruthenium
* IATA airline code for AirBridge Cargo
* ISO 3166-1 alpha-2 country code for Russia
* ISO 639 alpha-2 code for the Russian language
* .ru, the Internet country code top-level domain for Russia

Educational institutions

RU may stand for the following universities:

* Radboud University Nijmegen, in Nijmegen, Netherlands
* Radford University, in Virginia, USA
* Rajshahi University in Bangladesh
* Reykjavík University Iceland
* Rhodes University in Grahamstown, South Africa
* Rockefeller University in New York, USA
* Rockhurst University in Missouri, USA
* Rousse University in Bulgaria
* Rowan University in New Jersey, USA
* Rutgers University in New Jersey, USA

Cal Ripken's Real Baseball

* rUafraid, the god of RBO.