RHA
- Devanagari
- Moksha language
- RNA helicase
- Ra (disambiguation)
- Regional health authority (United Kingdom)
- Regional health authority (disambiguation)
- Religious Heritage of America
- Residence hall association
- Rha (Cyrillic)
- Rha, Netherlands
- Rhamnose
- Rice hulls
- Rivers and Harbors Act
- Road Haulage Association
- Rolled homogeneous armour
- Royal Hibernian Academy
- Royal Horse Artillery
- Steenderen
- Volga River