The original Baker Street Irregulars are fictional characters featured in the Sherlock Holmes stories of Arthur Conan Doyle. The group of street urchins is led by an older boy called Wiggins, whom Holmes paid a shilling per day (plus expenses), with a guinea prize (worth one pound and one shilling) for a vital clue, to collect data for his investigations.
The group appears in the first Sherlock Holmes story, A Study In Scarlet (1887). They also appear in the next novel, The Sign of the Four (1890), in which one of the chapters is titled "The Baker Street Irregulars".
The Baker Street Irregulars ("my Baker Street boys") later appear in "The Adventure of the Crooked Man" (1893).