Franz Bernhard Lucas (15 September 1911, in Osnabrück – 7 December 1994, in Elmshorn) was a German concentration camp doctor.

He was summoned to the Führungshauptamt - Office Group D - in order to provide medical services to the Waffen-SS in Berlin beginning on October 1.

As of 15 December 1943, he was transferred to the Office D III for Sanitation and Camp Hygiene of WVHA in Oranienburg, led by Enno Lolling.

On 8 December 1944, as Lagerarzt (camp doctor) and SS-Obersturmführer in Stutthof concentration camp, Lucas inspected the dead body of Justus Nussbaum, the brother of Osnabrück's famous painter Felix Nussbaum, to attest that Justus allegedly deceased in Lager-Block 13 at 6:50 a.m. on 7 December 1944 of a general cardiac insufficiency.

"[3] The reason for this disagreement with Treite was that Lucas was issuing death certificates for the deceased prisoners from the concentration camp Uckermark, but they would never take a closer look.

When the verdict was reviewed by the Federal Supreme Court on 20 February 1969, it was decided that the question of the "compulsion at the ramp" of Auschwitz must be rethought due to the positive character image Lucas presented in the trial.

During these proceedings, many prisoners spoke positively about Lucas, while the statements that led to his earlier condemnation were judged to be based on hearsay.

Lucas was "involved in the extermination of human beings", but "did not deal with perpetrators, but only against his will", citing the so-called "putative emergency" according to § 52 StGB.