Gustavo Alejandro Lillo (born August 8, 1973, in Mendoza) is a retired Argentine professional footballer. He played 1 game in the UEFA Intertoto Cup 2002 for FC Krylia Sovetov Samara.
Lillo retired in December 2008 after playing for Guaymallén in the Argentinean Torneo Argentino B, the fourth division.