Manuel Delgado Villegas (Spanish pronunciation: [manw'el del'?aðo ßi'?e?as]; 25 January 1943 – 2 February 1998), also known as El Arropiero, was a Spanish serial killer active between 1964 and 1971.
Delgado claimed to have carried out 48 murders in Spain, Italy and France – of these cases the Spanish police were only able to investigate twenty-two in Spain and considered him the definite perpetrator of seven.
He was never brought to trial, as he was diagnosed with a severe mental disorder, and in 1978 the Audiencia Nacional ordered that he be preventively detained at Carabanchel Penitentiary Psychiatric Hospital.
He was released into the care of a psychiatric hospital in 1996 and died two years later of a smoking-related lung disease.