Erwin Hermann Lambert was a German perpetrator of the Holocaust. By trade, he was a master mason, building trades foreman, Nazi Party member and member of the Schutzstaffel with the rank of SS-Unterscharführer (corporal). He supervised construction of the gas chambers for the Action T4 euthanasia program at Hartheim, Sonnenstein, Bernburg and Hadamar, and then at Sobibór and Treblinka extermination camps during Operation Reinhard. He specialized in building larger gas chambers that killed more people than previous efforts in the extermination program.