Solvay, Ernest, 1838-1922, Belgian industrial chemist and philanthropist. He originated the Solvay process and established (1863) near Charleroi, Belgium, the first plant for making soda by this process; later, plants were set up in many countries. He founded at Brussels the Solvay institutes of physiology (1893) and sociology (1901) and made large gifts to European universities.

Solvay may refer to

• Solvay - a Belgian pharmaceuticals, chemicals and plastics company
• the Solvay process
• Ernest Solvay, its inventor
• Solvay Conference
• the Solvay Business School
• Solvay, New York