MOSAIC may refer to:

• Mosaic (geodemography)
• MOSAIC Research Group
• MOSAIC Threat Assessment Systems
• MOSAIC (housing cooperative)
• MOSAIC (web browser)
• Model of Syntax Acquisition in Children, an instance of CHREST

Mosaic is the art of creating images with an assemblage of small pieces of colored glass, stone, or other materials. It is a technique of decorative art or interior decoration. Most mosaics are made of small, flat, roughly square, pieces of stone or glass of different colors, known as tesserae; but some, especially floor mosaics, may also be made of small rounded pieces of stone, and called "pebble mosaics".