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The fifteenth topical meeting on Optical Interference Coatings (OIC) was held June 19-24, 2022 in Whistler, British Columbia, Canada. This feature issue of Applied Optics collects selected papers presented during this conference. The OIC topical meeting takes place every three years and is a pivotal event for the international community working in the field of optical interference coatings. The conference provides premier opportunities for attendees to share knowledge on their new advances in research and development and to build bridges for further collaborations. The meeting topics cover a broad range, from fundamental research, coating design theory, new materials, deposition and characterization technologies to a vast catalogue of applications including green technologies, aerospace, gravitational wave detection, communication, optical instruments, consumer electronics, high power and ultra-fast lasers, and many others.