NBA may stand for: - National Basketball Association (U.S. & Canada), the greatest men's professional basketball league in the world
- NBA TV, a television network showcasing the National Basketball Association
- n-Butylamine an organic compound
- National Board of Accreditation - An autonomous body in India which marks the quality of institutes in technical education
- National Boxing Association (U.S.), a major boxing sanctioning body which became the World Boxing Association in 1962
- National Boxing Association, a minor boxing sanctioning body, founded in 1984
- National Braille Association (U.S.)
- North British Academy of Arts (UK)
- Net Book Agreement (UK)
- Network Behavior Analysis, the monitoring of network for security
- Newcastle Brown Ale (UK)
- National Bar Association (U.S.)
- National Book Award, an award given for literary achievement in the U.S
- Narmada Bachao Andolan, a political movement in India against a dam built on the Narmada river
- Nepal Basketball Association, the national basketball association of Nepal
- Neue Bach-Ausgabe, the second complete edition of the music of J. S. Bach
- 3-Nitrobenzyl alcohol
- 3-Nitrobenzanthrone
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