JCA is an abbreviation for:
- Japan Chess Association, the umbrella organization for chess players in Japan
- Java Cryptography Architecture, a standard Java application programming interface ( API) for cryptography
- Java EE Connector Architecture, a software architecture and programming interface (API ) for integration of heterogeneous applications in the Java EE platform.
- Jewish Colonization Association, an association founded in 1891, for the establishment of Jewish colonies in America