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50th Infantry Regiment
Active	1932 – 1935
Allegiance	Bolivia
Type	Penal battalion
Role	Infantry
Nickname(s)	Knives of Death
Engagements	Chaco War
Commanders
Notable Commanders	Colonel Bernardino Bilbao Rioja

The 50th Infantry Regiment (Cuchilleros de la Muerte) was a Bolivian infantry regiment that fought in the Chaco War. Nicknamed the Knives of Death (Spanish: Cuchillos de la Muerte), the regiment relied almost exclusively on the use of blade weapons, particularly bayonets. The personnel were recruited from Bolivian prisons and under command from army and police officers. Their targets were Paraguayan isolated patrols and astray soldiers.

The regiment was established by Bolivian Colonel Bernardino Bilbao Rioja after his men found the remains of 20 bodies of Bolivian soldiers, hacked to death by members of the Paraguayan Macheteros de Jara. As retaliation, the Bolivian Army recruited rogue police and military officers and a number of seasoned criminals into the new regiment, whose mission was to harass and spread panic among Paraguayan troops in the rearguard.

• Macheteros de Jara - Paraguayan equivalent and predecessor.

• Michel, Pablo (29 September 2016) La Historia del Regimiento 50 de Infantería, los "Cuchilleros de la Muerte", Fortin De La Patria, Oruro
• Noticias de Bolivia - Periódico La Patria (Oruro - Bolivia)