John Lynch (1813 – 22 April 1842) was an Irish-born Australian serial killer, convicted for the murder of Kearns Landregan, but is believed to have killed 10 people in the Berrima area of New South Wales from 1835 to 1841.
Possibly the worst serial killer in Australian history, Lynch was a bushranger who murdered and robbed cattle and laborers in the trails around Berima.
Lynch was sentenced to death, and was executed in 1842.