RHA is an acronym that may refer to:

• Rolled homogeneous armour
• Regional health authority (disambiguation)
• Religious Heritage of America
• Residence hall association
• Rice husk ash, a by-product from rice culture used as cement admixture
• Rivers and Harbors Act, any number of various acts of legislation of the United States Congress
• Road Haulage Association
• Royal Hibernian Academy, and the post-nominal letters used by its members
• Royal Horse Artillery
• RNA helicase, an enzyme

Rha may refer to:

• Rha, Netherlands, a population center in Steenderen
• Rhamnose, a monosaccharide
• Volga River (the ancient name of the river in Latin, from Ancient Greek Ῥᾶ, thought to be a borrowing from reconstructed Scythian *Rā or *Rahā)
• Rha (Cyrillic), a Cyrillic letter

Letters from alphabets that can be called rha:

• र, ड़', ढ़, र्ह — Devanagari letters which can be called ra, ṛa or rha;
• Ԗ — the 23rd letter rha («ра») in the older (1924−1927) Moksha language Cyrillic alphabet

See also

• Ra (disambiguation)