"The Adventure of the Cardboard Box" is a Sherlock Holmes short story by Sir Arthur Conan Doyle, first published in The Strand Magazine in the UK in January 1893 and in Harper's Weekly in the US on January 14, 1893. The story involves Miss Susan Cushing receiving a disturbing parcel containing two severed human ears, prompting Holmes to investigate what appears to be evidence of a serious crime rather than a mere prank.