Emil Collett (22 December 1875 – 9 June 1940) was a Norwegian chemist and entrepreneur. He graduated from the Norwegian Military Academy as an officer in 1895 and studied chemistry in Berlin, obtaining a doctorate in 1903. With Sam Eyde, he founded Elektrokjemisk A/S i 1904. He then served as director of Notodden Salpeterverk A/S, head of Norsk Hydro's research department and director at Norsk Aluminium Company A/S. In 1933, he founded with his brother Ove Collett, and their main product was . A member of the Collett family, he was the son of landowner Albert Collett, and was married to .