XA, xA, or xa may refer to:

• Chi Alpha, a Christian college group
• Extended addressing, a processor architecture first introduced by IBM in 1981 in the System/370 model 3081 mainframe computer
• eXtended Architecture, a standard for Global Transactions.  X/Open XA
• eXtended Architecture, a standard for CD-ROM. CD-ROM XA
• Abbreviation for the name format

A rural commune ( Chữ nôm:社) is a third-level (commune-level) administrative subdivision of Vietnam. Rural communes are subdivisions of counties , which are in turn subdivisions of provinces .