Industry 4.0 refers to the Fourth Industrial Revolution that encompasses smart industries, smart grids, intelligent transportation, real-time healthcare, etc. bolstered by automation and cyber-physical systems. Detail studies and researches are required to design and develop sustainable technologies for Industry 4.0 since they depend on complex relations among humans, systems and objects. The 2nd event of STI 2020 gathered around 12 distinguished keynote speakers, 290 authors, 100 senior academicians, 30 industry practitioners from 29 countries of the World. STI 2021 welcomes researchers, industry professionals and practitioners to display their scientific achievements and sustainable innovative industrial developments in the fields of computer science & engineering, electrical & electronic engineering, textile engineering, robotics and cyber-physical systems that are entering into Industry 4.0. STI 2021 will be held at the permanent campus of Green University of Bangladesh, Purbachal American City, Dhaka, Bangladesh during 18-19 December 2021. We are seeking original high-quality innovative research for submissions. All submissions to STI 2021 will be double blind peer reviewed. Accepted and presented papers will be submitted to the IEEE Xplore digital library. Papers presenting original research are being sought within following tracks: Track 01: Intelligent Computing, Networking and Security Systems · Augmented Reality, Virtual Reality, Bioinformatics · Computational Linguistic and Natural Language Processing · Computer Vision, Image Processing and Pattern Recognition · Artificial Intelligence in Autonomous Vehicles · AI and Machine Learning in Smart Grid Power System · Concurrence of 5G, Cloud, Fog and Edge Computing · AI in Robotics and Automation · Digital Twins · Data Mining Techniques for Business Intelligence · Transfer Learning in Industry Applications · Computer Network and Information Security · Big Data Analytics and Blockchain Technologies Track 02: Energy, Robotics, Electronics, Sensors and Communications · Smart Grid & Micro Grid, Renewable Energy & Sustainability · Nuclear Physics and Biochemical Engineering · Industrial Automation, Robotic Design and Applications · Advanced Microcontrollers and Embedded Systems Design · Green Electrical Components, Circuits, Devices and Systems · Control System and Power Electronics · VLSI Design and Graph Theory · Remote Sensing and Smart Sensor Design · Sustainable Nanotechnology and Materials Science · Signal Processing, Telecommunications and RF engineering Track 03: Textiles and Other Industry 4.0 Applications · Smart Textiles and Clothes · Sustainable Machine Design · Automated Inspection and Maintenance · Green Manufacturing of Yarn & Fabric and Fashion Design · Advanced Spinning, Dyeing, Printing and Finishing · Smart Home City Industries Health Agriculture · Autonomous and Unmanned Aerial Vehicles · Smart Education Education 4.0 · Industrial Policies Aligning SDG