Milton Óscar Casco (born 11 April 1988) is an Argentine professional footballer who plays as left-back for River Plate.

Born in María Grande, Entre Ríos Province, Casco began his professional career with Gimnasia y Esgrima La Plata of the Argentine Primera División in 2009.

[4] On 9 September 2015, Casco signed a three-year contract with CA River Plate, with the Buenos Aires–based club purchasing 85% of his economic rights for $3 million.

[8] On 13 September 2022, he extended his contract until December 2025[9] On 27 May, uncapped Casco was selected by coach Gerardo Martino for the 2015 Copa América in Chile.

Absent from the national team since the 2015 tournament, Casco was a surprise inclusion for the 2019 Copa América in Brazil, with Lionel Scaloni picking him ahead of Gabriel Mercado.