Peter Landau (26 February 1935 – 23 May 2019) was a German jurist, legal historian and expert on canon law.
After his doctoral promotion in 1964 and a habilitating in 1964, Landau accepted a call to University of Regensburg where he became a regular professor.
This office included the post as director of the Leopold Wenger Institute for Legal History.
He was president of the Society for Medieval Canon Law at Zurich, Switzerland, from 1988 to 2000 and since 1993 he was a member of the advisory board of the Max Planck Institute for European History of Law at Frankfurt am Main.
Landau's research areas outside of the narrower subject also included the Communist and first Bavarian Prime Minister Kurt Eisner (USPD).