NSAI

NSAI may refer to:


 * Nashville Songwriters Association International, songwriting preservation and education society
 * National Spatial Address Infrastructure, a United Kingdom government initiative
 * National Standards Authority of Ireland, the ISO member body for the Republic of Ireland
 * Nonsteroidal anti-inflammatory drug, a group of analgesic drugs
 * Nonsteroidal aromatase inhibitor, a class of drugs used in treatment of breast cancer