John George Haigh (; 24 July 1909 – 10 August 1949), commonly known as the Acid Bath Murderer, was an English serial killer who was convicted for the murders of six people, although he claimed to have killed nine.
Haigh battered to death or shot his victims and disposed of their bodies using sulphuric acid before forging their signatures so he could sell their possessions and collect large sums of money.