Daniel Gabriel Fahrenheit (24 May 1686 – 16 September 1736) was a physicist, engineer, and glass blower who is best known for inventing the alcohol thermometer (1709) and the mercury thermometer (1714), and for developing a temperature scale now named after him.

Fahrenheit was born in Danzig (Gdańsk), in the Polish-Lithuanian Commonwealth, into a German Hanse merchant family, but he spends most of his life in the Dutch Republic.