RCX

RCX may refer to:
 * Remote code execution, when malware can run its own code on a compromised system
 * RCX register, a 64-bit processor register of x86 CPUs
 * Rally Championship Xtreme
 * Retrocommissioning (RCx), see
 * A Lego Mindstorms controller device
 * The circumflex branch of left the coronary artery