IEEE/SICE SII is the premier symposium series presenting the state of the art and future perspectives of System Integration, where industry experts, researchers, and academics share ideas and experience surrounding frontier technologies, breakthrough and innovative solutions and applications. The 2026 IEEE/SICE International Symposium on System Integration (SII 2026) will be the 18th edition of the symposium. System integration is one of the key technologies in Systems Engineering where the integration of hardware and software is critical to solve industrial or social system problems in the new century. This symposium focuses on the new research and industrial applications of system integration, and discusses improvements to the effectiveness of system integration.