Emil Julius Carl Kessler (20 August 1813 – 16 March 1867) was a German businessman and founder of the Maschinenfabrik Esslingen ('Esslingen Engineering Works').
Kessler was born in Baden-Baden, attended school there and later studied constructional and mechanical engineering in Karlsruhe.
In 1837 he founded an engineering works with Theodor Martiensen in Karlsruhe, where tools, small machines and railway equipment were manufactured.
Kessler's bid was successful and in 1841 he built his first steam locomotive, the Badenia for the Grand Duchy of Baden State Railway (Großherzoglich Badische Staatsbahn).
Because Württemberg also wanted to have its own production facility for the emerging railways, Emil Kessler founded the Maschinenfabrik Esslingen that delivered its first engine in 1847.