Maximilian Emil Hehl (Kassel, September 17, 1861 - São Paulo, August 27, 1916) was a German engineer and architect active in Brazil.
Son of Johannes Hehl, director of the Kassel Polytechnic College, and Carolin Wolff Hehl, he studied engineering in the University of Hanover. In 1888 he migrated to Brazil to work with railway construction in Minas Gerais. He moved later to São Paulo where he, in 1898, became professor at the University of São Paulo Polytechnic School.
His major work was the project of the São Paulo Cathedral in neo-Gothic style, which he died before the conclusion of. He also designed Santos Cathedral and the Consolação Church (São Paulo).