RHA

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