nai

Nai or NAI may refer to:

Music

Nai (album), an album by singer Anna Vissi
Nai (pan flute), a wind instrument, also known as a pan flute (Romania and Moldova)
"Nai" (song), a 2007 CD single by Irini Merkouri

NASA Astrobiology Institute, an organization supporting research of life in the universe
National Academy of Inventors, a US non-profit organization dedicated to encouraging inventors in academia
National Amusements, Inc, a privately owned media and entertainment company
National Association for Interpretation, a professional organization of interpreters
Natural Alternatives International, the company which manufactures the nutritional supplement Juice Plus
Netherlands Architecture Institute, a former Dutch architecture institute in Rotterdam
Network Advertising Initiative, an industry trade group that develops self-regulatory standards for online advertising
Network Associates, Inc., a corporation now known as McAfee, Inc.
New Alchemy Institute, a former research center and settlement in Cape Cod, Massachusetts (1969-1991)
New Atlantic Initiative, a defunct arm of the American Enterprise Institute
Norwegian Air International, an Irish airline