Smart glass, also known as switchable glass, dynamic glass, and smart-tinting glass, is a type of glass that can change its optical properties, becoming opaque or tinted, in response to electrical or thermal signals. This can be used to prevent sunlight and heat from entering a building during hot days, improving energy efficiency. It can also be used to conveniently provide privacy or visibility to a room.

Claes-Göran Sture Granqvist is a materials physicist and Professor of Solid State Physics at Uppsala University in Sweden. Granqvist is considered a pioneer and expert in photochromic materials and energy-efficient building materials such as glass, paint, and wood.