Jack the Ripper is the name given to an unidentified serial killer that terrorized which city in 1888?

Jack the Ripper is the best-known name for an unidentified serial killer generally believed to have been active in the largely impoverished areas in and around the Whitechapel district of London in 1888. In both the criminal case files and contemporary journalistic accounts, the killer was called the Whitechapel Murderer and Leather Apron.

Attacks ascribed to Jack the Ripper typically involved female prostitutes who lived and worked in the slums of the East End of London whose throats were cut prior to abdominal mutilations. The removal of internal organs from at least three of the victims led to proposals that their killer had some anatomical or surgical knowledge. Rumors that the murders were connected intensified in September and October 1888, and letters were received by media outlets and Scotland Yard from a writer or writers purporting to be the murderer. The name "Jack the Ripper" originated in a letter written by someone claiming to be the murderer that was disseminated in the media. The letter is widely believed to have been a hoax.

The large number of attacks against women in the East End during this time adds uncertainty to how many victims were killed by the same person. Eleven separate murders, stretching from 3 April 1888 to 13 February 1891, were included in a London Metropolitan Police Service investigation and were known collectively in the police docket as the "Whitechapel murders".