Max Julius Louis Le Blanc (1865 – 1943) was a German physical chemist who worked in the field of electrochemistry, writing an influential textbook in 1895 on the subject which went through several editions. He was a professor at the Technical University of Karlsruhe, later at the Wilhelm Ostwald Institute at Leipzig. He is best known for inventing the hydrogen electrode used for pH measurements. In 1933 he was a signatory to the Vow of allegiance of the Professors of the German Universities and High-Schools to Adolf Hitler and the National Socialistic State.