Bernard O. Gruenke, American stained glass artist (born 1914)

Bernard Otto Gruenke was an American stained glass artist who produced one of the first faceted glass windows in the United States in 1949. He was born in Sheboygan, Wisconsin.

Stained glass refers to coloured glass as a material or art and architectural works created from it. Although it is traditionally made in flat panels and used as windows, the creations of modern stained glass artists also include three-dimensional structures and sculpture. Modern vernacular usage has often extended the term "stained glass" to include domestic lead light and objets d'art created from glasswork, for example in the famous lamps of Louis Comfort Tiffany.