XN may refer to:
xn-- in the ASCII representation of internationalized domain names Christians, based on the Greek letter Chi used by early Christians Nordic Patent Institute (two-letter code XN) A nuclear reaction that is expected to produce one or more neutrons Xpress Air (IATA code XN, 2003–2021), an Indonesian airline XN bit (or NX bit), a security-related computer technology for x86 and x64 processors
See also XNN (disambiguation)