Rafael Arlex Castillo (born June 6, 1980) is a Colombian footballer who plays as a midfielder.
He previously played for the former San Antonio Scorpions of the NASL and the Colombia national football team between 2001 and 2003.
He was brought in between the Spring and Fall 2014 North American Soccer League seasons and immediately started.
He played attacking midfield for the Scorpions and helped lead the team to the 2014 NASL Championship.
Castillo's effort in the final also included an assist to Billy Forbes on a sublime through-ball that split the defense.