Mario Oscar Ferreyra, better known as Malevo Ferreyra (June 17, 1945 – November 21, 2008) was an Argentine police chief.
Being a police officer during the Proceso de Reorganización Nacional, he participated in the Dirty War, fighting against left-wing guerrilla groups in Tucuman province.
After the return of democracy, he would become the chief of Tucumán Provincial Police.
In this position, Ferreyra became involved in the dubious death of a number of supposed criminals.
He would later be prosecuted and discharged from the force.
He shot himself in 2008, when facing his imminent arrest, and his suicide was broadcast live on national TV.