Udo Gustav Wilhelm Egon von Woyrsch was a Nazi Party politician and SS-Obergruppenführer in Nazi Germany who participated in the massacre of Jews in Poland, and was later convicted of being an accessory to manslaughter in connection with the Night of the Long Knives murders.

Obergruppenführer was a paramilitary rank in Nazi Germany that was first created in 1932 as a rank of the Sturmabteilung (SA) and adopted by the Schutzstaffel (SS) one year later. Until April 1942, it was the highest commissioned SS rank after only Reichsführer-SS. Translated as "senior group leader", the rank of Obergruppenführer was senior to Gruppenführer. A similarly named rank of Untergruppenführer existed in the SA from 1929 to 1930 and as a title until 1933. In April 1942, the new rank of SS-Oberst-Gruppenführer was created which was above Obergruppenführer and below Reichsführer-SS.