Karl Ludwig Sand (Wunsiedel, then in Prussia, 5 October 1795 - Mannheim, 20 May 1820) was a German university student and member of a liberal Burschenschaft (student association). He was executed in 1820 for the murder of the conservative dramatist August von Kotzebue the previous year in Mannheim. As a result of his execution, Sand became a martyr in the eyes of many German nationalists seeking the creation of a united German national state.