"The Adventure of the Reigate Squire", also known as The Adventure of the Reigate Puzzle or "The Adventure of the Reigate Squires", was one of the 56 Sherlock Holmes short stories written by Sir Arthur Conan Doyle. The Adventure of the Reigate Squires was first published in 1893. It is one of 12 stories in the cycle collected as The Memoirs of Sherlock Holmes. Doyle ranked "The Adventure of the Reigate Squire" twelfth in his list of his twelve favorite Holmes stories.

The elder Cunningham's confidence is broken after his arrest and he tells all. It seems that William followed his two employers the night they broke into the Acton estate (Holmes has already deduced that it was they, in pursuit of documents supporting Mr. Acton's legal claim, which they did not find). William then proceeded to blackmail his employers – not realizing that it was dangerous to do such a thing to Alec – and they thought to use the recent burglary scare as a plausible way of getting rid of him. With a bit more attention paid to detail, they might very well have evaded all suspicion.

Famous works of the author Arthur Conan Doyle: A Study in Scarlet, The Sign of the Four, The Adventures of Sherlock Holmes, The Memoirs of Sherlock Holmes, The Hound of the Baskervilles, The Return of Sherlock Holmes, The Valley of Fear, His Last Bow, The Case-Book of Sherlock Holmes, Stories of Sherlock Holmes, The Lost World.