Ruo or RUO may refer to:
- Ruo (state), a small vassal state during the Chinese Zhou Dynasty
- Istro-Romanian language, spoken in Croatia (ISO 639 code = ruo)
- Huang Ruo, a Chinese-born American composer
- Ruo River, a tributary of the Shire River in Malawi and Mozambique
- Ruo Shui, a large river of northern China
- Emoh Ruo is a 1985 Australian comedy film
- Ruo, Federated States of Micronesia, a village and municipality in the state of Chuuk
- RUO, an abbreviation for "Research Use Only": designation for diagnostic products or reagents by the FDA
This disambiguation page lists articles associated with the title Ruo.If an internal link led you here, you may wish to change the link to point directly to the intended article. Category: