Adolphus Frederick "Dolly" Williamson (1830 – 9 December 1889) was the first head of the Detective Branch of the Metropolitan Police and the first head of the Detective Branch's successor organisation, the Criminal Investigation Department (CID). He joined the force in 1850 and eventually became Chief Constable.
In the Steampunk book series The Guild Chronicles by J.M. Bannon Williamson is used as a character. The prequel to the series is titled "The Untold Tales of Dolly Williamson" and is a fictional story of the detective's involvement in solving a crime with a supernatural killer. The book is considered an example of the steampunk genre.