Reiner Mährlein (b. 1959, Kaiserslautern, Germany) is a German sculptor and printmaker whose work explores the dynamic relationship between industrial materials and natural forms. He studied at the Academy of Fine Arts in Nuremberg and the École Nationale Supérieure des Beaux-Arts in Paris before establishing himself as a freelance artist in 1989. Mährlein lives and works in Rothselberg and Kaiserslautern, Germany.

Working primarily with steel, iron, and granite, Mährlein creates site-responsive sculptures that investigate themes of tension, transformation, communication, and the interplay of mass and void. His practice extends to printmaking processes, including rust monotypes, granite embossing, and intaglio techniques. His sculptures and public art commissions have been installed throughout Germany and internationally, including collaborative public works in Columbia, South Carolina. Mährlein has participated in numerous international sculpture symposia and has received recognition including nominations for the Pfalz Prize and awards such as the Albert Haueisen Art Prize and the Sickingen Art Prize.