NOPA can refer to:
Norwegian Society of Composers and Lyricists, a society for Norwegian musicians NOPA (wine), a technique to measure amino acids in grape juice NOPA (optics), a technique in nonlinear optics No possible agreement, the opposite of a zone of possible agreement USS Oscar Austin, an American destroyer launched in 1998 (callsign NOPA) National Office Products Alliance; see List of acronyms: N#NO National Office Products Association; see List of acronyms: N#NO