Ricardo Alberto Barreda (16 June 1936 – 25 May 2020) was an Argentine convicted mass murderer and former dentist. He was born in La Plata, Argentina. In 1992, he murdered his wife, two daughters and his mother-in-law. In 1995, he was sentenced to life imprisonment. He was granted house arrest in 2011, but was soon put back in jail after raping someone in Buenos Aires. 