"The Adventure of the Priory School" is a Sherlock Holmes short story by Sir Arthur Conan Doyle, part of The Return of Sherlock Holmes collection. It was first published in Collier's in the US on January 30, 1904, and in The Strand Magazine in the UK in February 1904. The story involves Holmes investigating the disappearance of a young pupil, Lord Saltire, from a prestigious preparatory school, along with the school's German master and his bicycle.