Jonathan Emanuel Castillo (born 5 January 1993) is an Argentine footballer who plays as a defender for Siracusa.
In 2014, Castillo signed for Sportivo Italiano in the Argentine third division after playing for Boca Juniors, Argentina's most successful club.
In 2016, he signed for Argentine fourth division side Luján from Chungju Hummel in the South Korean second division.
In 2017, he signed for Argentine fourth division team Deportivo Armenio before joining Siracusa in the Italian fifth division.