Ulrich-Wilhelm Graf Schwerin von Schwanenfeld (21 December 1902 – 8 September 1944) was a German landowner, officer, and resistance fighter against the Nazi régime.
Count Schwerin von Schwanenfeld was born in the Danish capital, Copenhagen, the son of a diplomat. He finished school at the convent of Roßleben in 1921 and went to study agronomy at the Technical University of Munich. As a witness of the 1923 Beer Hall Putsch, he found Nazism loathsome to his Christian and social convictions (he was a Knight of Justice in the Protestant Order of Saint John, to which he had been admitted in 1933). Schwerin was graduated at Breslau in 1926 and administered his family's manors in Göhren (today part of Woldegk, Mecklenburg) and Sartowice near Świecie, Pomerelia in Poland. In 1928, he was married to Marianne Sahm, a daughter of Heinrich Sahm, then president of the Free City of Danzig senate.
Already by 1935, he held the view that Adolf Hitler must be killed to be brought down. Beginning in 1938 ahead of the German occupation of Czechoslovakia, Schwerin belonged to the tightest circle of the resistance along with his personal friends Peter Graf Yorck von Wartenburg and Fritz-Dietlof Graf von der Schulenburg, and later also to the Kreisau Circle. With the beginning of World War II, he was called up to the Wehrmacht as an officer in the staff of Generaloberst Erwin von Witzleben. After Witzleben's dimissal in 1942, Schwerin was transferred to Utrecht until in March 1943, Major General Hans Oster appointed him to the Abwehr office at the Oberkommando der Wehrmacht in Berlin.