The Balcombe Street Gang was a Provisional Irish Republican Army (IRA) active service unit (ASU) (also known as the Balcombe Street Four or the Balcombe Street Unit) who carried out a bombing campaign in southern England in the mid-1970s. The majority of their attacks and attempted attacks took place in London and the rest in Surrey, Hampshire and Wiltshire. Between October 1974 and December 1975 they carried out approximately 40 bomb and gun attacks in and around London, sometimes attacking the same targets twice. The unit would sometimes carry out two or more attacks in one day; on 27 January 1975 they placed seven time bombs in London.