Na

Na may refer to:

• Na (state) (那), small state of Zhou Dynasty
• Na (羅), Korean surname, Ra, La in official common, Luo in Chinese
• Na (kana), a Japanese kana
• Na (tree) or Mesua ferrea, a species of tree native to Sri Lanka
• .na, the top-level domain for Namibia
• Na people, a small tribal group in India
• Mosuo or Na, a small ethnic group in China near Tibet
• Nauruan language, ISO code
• Sodium's chemical symbol
• Avogadro constant, N_A

NA or N.A. may refer to:

Abbreviations:

• North America, a continent
• Narcotics Anonymous, a twelve-step program that focuses on addiction
• National bank (National Association), in the United States
• National Academician, a member of the National Academy of Design
• Numerical aperture, a number that characterizes a range of angles in an optical system
• Neuroacanthocytosis
• Noradrenaline or norepinephrine, a hormone
• National Alliance (Netherlands), a former Dutch political party
• National Association of Professional Base Ball Players, the first professional baseball league
• Emotions Anonymous (formerly Neurotics Anonymous)
• Nucleic acid analogues
• Virgin New Adventures, a series of Doctor Who novels

Codes:

• Namibia, ISO country code
• North American Airlines, IATA code
• Naples' Italian car number plates provincial designator
• Netherlands Antilles' former international vehicle registration code