Christian Carlos Hernan Castillo (born March 28, 1967) is an Argentinian activist, politician, sociologist and university teacher.
He is a founding member of the Socialist Workers' Party (Argentina) (PTS).
In the 2013 elections he was voted in as a deputy for the Buenos Aires Provicne for the Workers Left Front; he resigned to his seat on June 10, 2015 to leave his place to the next candidate based on the banking rotation between the different parties that make up the Front.