The International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT) is a premier global conference in the field of optical manufacturing and testing. First held in 2000, the Symposium has successfully convened eleven editions to date. All previous proceedings were published by SPIE and indexed by EI Compendex. The 12th AOMATT will take place in Chengdu in November 2026, hosted by Committee of Optical Manufacturing Technology, Chinese Optical Society, Optical Society of Sichuan, Institute of Optics and Electronics, Chinese Academy of Sciences, and organized by Tianfu Xinglong Lake Laboratory, the 29th Research Institute of China Electronics Technology Group Corporation (CETC) and Cheng Guangjingjie (Sichuan) Technology Co., Ltd. The symposium will feature 8–10 topical sessions covering cutting-edge directions in optical manufacturing. The conference will include the annual meeting of the Optical Society of Sichuan, the general assembly of the Committee of Optical Manufacturing Technology, Chinese Optical Society, industrial alliance activities, an optoelectronic products exhibition, and poster sessions.