Semiconductor UV photonics research has emerged as one of the most heavily invested areas among semiconductor photonics research due to numerous crucial applications such as sterilization, sensing, curing, and communication. The feature issue disseminates nine timely original research and two review papers from leading research groups and companies, covering most frontiers of the semiconductor UV photonics research, from epitaxy, device physics and design, nanostructures, fabrication, packaging, reliability, and application for light-emitting diodes, laser diodes, and photodetectors.