Sustainable photonics is a research field and technological approach focused on developing and applying photonic science and technology with minimal environmental impact and maximum resource efficiency across their lifecycle. This domain investigates the sustainable design, materials, manufacturing, deployment, and end-of-life management of photonic components and systems, emphasizing characteristics such as energy efficiency, resource conservation, use of non-toxic and recyclable materials, and adherence to circular economy principles. Its significance lies in enabling environmentally responsible technological advancement essential for addressing global sustainability challenges within the context of light-based technologies.