George Ravenscroft

Rummer with coat of arms of John III Sobieski and the City of Gdańsk by George Ravenscroft's glassworks, engraved by Willem Mooleyser, 1677–1678, National Museum in Warsaw

George Ravenscroft (1632 – 7 June 1683) was an English businessman in the import/export and glass making trades. He is primarily known for his work in developing clear lead crystal glass (also known as flint glass) in England.