Wilhelm (Willi) Graf (1918–1943) was a German medical student and member of the White Rose resistance group that opposed the Nazi regime during World War II. Born on January 2, 1918, in Kuchenheim, Rhineland, Graf was raised in a devout Catholic family. In 1929, he joined the Catholic youth organization "Neudeutschland" (New Germany) and later became involved with the "Grauer Orden" (Gray Order), participating in clandestine activities that fostered his commitment to social justice and opposition to totalitarianism.

In 1937, Graf began his medical studies at the University of Bonn. His academic pursuits were interrupted in 1939 when he was conscripted into the Wehrmacht as a medical orderly. During his military service, he was stationed in various locations, including the Eastern Front, where he witnessed the atrocities committed by the Nazi regime. These experiences deepened his resolve to resist. In 1942, while continuing his studies at the University of Munich, Graf connected with fellow students Hans and Sophie Scholl, joining the White Rose movement. The group clandestinely produced and distributed leaflets condemning Nazi crimes and calling for active opposition to the dictatorship.

The Gestapo arrested Graf on February 18, 1943, following the capture of the Scholls. After enduring months of interrogation and imprisonment, he was sentenced to death by the People's Court. Willi Graf was executed on October 12, 1943, in Munich's Stadelheim Prison.