XA, xA, or xa may refer to:
Finance
- Athens Stock Exchange, often abbreviated as ΧΑ in Greek
Organizations
- Chi Alpha, a Christian college group
- Golden Dawn (political party), from the Greek initials
Technology
Computing
- X/Open XA, a standard for distributed database transactions
- ".xa". or ".XA", an audio file extensions used in the PlayStation and PSone
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- CD-ROM XA, an extension to the CD-ROM storage format
- A Maxis proprietary audio format used by games The Sims and SimCity 3000
Aerospace
- XA, aircraft registration prefix for Mexican commercial aircraft
- XA, United States aircraft designator for Experimental Attack
Other technologies
- Scion xA, a car
- Fantom-X, a synthesizer made by Roland Corporation
- Olympus XA, a camera
Other
- xA, expected assists, performance metric
- Xã, a rural commune, a third-level administrative subdivision in Vietnam
- XA, acronym of American rock band X Ambassadors