Arma or ARMA may refer to:

• Arma (god) in Hittite mythology
• Armas (the Arma people), an ethnic group of the middle Niger River valley
• Arma, Kansas, a small city in the United States
• Arma, Nepal
• Arma, an extinct Choco language
• Agung Rai Museum of Art located in Ubud, Bali (Indonesia) - also related to the ARMA resort
• ArmA: Armed Assault, a video game
• ARMA 2 (Armed Assault 2), a video game
• Armenian Medical Association, a professional union of doctors and public health professionals in Armenia
• Association of Records Managers and Administrators, now "ARMA International"
• Association for Renaissance Martial Arts
• Autoregressive moving average model, a methodology in statistics

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