Bernhard "Isidor" Weiß [Weiss] (born 30 July 1880 in Berlin, died 29 July 1951 in London) was a German lawyer and Vice President of the Berlin police during the Weimar Republic. The initial "Isidor" was coined by Goebbels meant to mark his Jewishness.
Born into a prominent, liberal Jewish family, he earned a doctorate of law after studying law at the University of Berlin, the University of Munich, the University of Freiburg im Breisgau and the University of Würzburg. Subsequently, he was trained as a military officer, and served as a Rittmeister during World War I, when he was decorated with the Iron Cross First Class.
He was appointed Deputy Chief of the Berlin Criminal Police in 1918, and became its head in 1925. He was appointed Vice President of the Berlin police force in 1927. Weiß was a member of the liberal Deutsche Demokratische Partei (German Democratic Party). He played a central role during the political tension in the Weimar Republic, and was a fierce defender of the democratic republic against right-wing and left-wing extremists.
After the Nazi rise to power, he fled Germany, and settled in London. He was subsequently deprived of his German citizenship. In 1951, shortly after becoming a German citizen again, he died of cancer in London.
The Bernhard-Weiß-Medaille of the Bund jüdischer Soldaten in der Bundeswehr, the association of German-Jewish soldiers, is named in his honour.