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. Proceedings articles from AOMATT 2026 will be published in SPIE's Digital Library and be submitted to the major indexers. The 12th AOMATT will take place in Chengdu in November 2026, hosted by Optical Society of Sichuan, Committee of Optical Manufacturing Technology, Chinese Optical Society,  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), University of Electronic Science and Technology of China, Sichuan Normal University and Cheng Guangjingjie (Sichuan) Technology Co., Ltd. The symposium will feature 9 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.