This book presents the proceedings of the Biennial Photonics Conference (Photonics 2023) held at IISc, Bengaluru on 5-8 July 2023. It covers topics across multiple areas of photonics, including established areas like optical communication and networks, quantum optics, ​non-linear and ultrafast photonics​, nanophotonics​, biophotonics and bioimaging, ​​photonic integrated circuits​, fibers and sensors, optical materials and fabrication techniques, optical metrology, and instrumentation, optofluidics, ​laser applications, ​optoelectronics. The book also covers emerging areas in photonics, such as THz photonics, structured Light, 2D materials, optomechanics, topological photonics, and AI/ML in photonics. The book will be useful for researchers and professionals interested in the broad field of photonics.