"The Red-Headed League" is one of the 54 Sherlock Holmes short stories written by Arthur Conan Doyle. It first appeared in The Strand Magazine in August 1891, with illustrations by Sidney Paget. Conan Doyle ranked "The Red-Headed League" second in his list of his twelve favorite Holmes stories. It is also the second of the twelve stories in The Adventures of Sherlock Holmes, which was published in 1892.

Set in 1890, a London business man named Jabez Wilson, a man with red hair, comes to consult Holmes and Watson. He tells them that his young assistant, Vincent Spaulding, some weeks ago had shown him, and urged him to respond, to a newspaper want-ad offering work to only red-headed male applicants. The next morning, Wilson had waited in a long line of fellow red-headed men, was interviewed and was the only applicant hired, because none of the other applicants had hair to match Wilson's red locks.