Facundo Adrián Erpen Bariffo (born May 19, 1983, in Gualeguaychú) is an Argentine footballer.

[1] Erpen was part of the Boca Juniors youth system and played for Club Juventud Unida and Talleres de Córdoba[2] before signing with D.C. United in the summer of 2005.

[3] Erpen made 40 appearances for D.C. United, scoring 4 goals, and took part in the 2006 MLS All Star game, against FA Premier League champions Chelsea after being called up as a replacement for injured Eddie Pope.

Erpen was traded to the Colorado Rapids for Greg Vanney in June 2007, and played for two seasons for the Denver team before being released January 2009.

He was signed by USL First Division side Miami FC in April 2009,[4] but was waived after having just played five games for the team.