Guillermo Lucas Franco is a retired professional footballer (soccer). He was born on May 21, 1983, in Buenos Aires, Argentina. He started his professional career in 2003. He took a break to serve a mission in the Argentina Mendoza mission for The Church of Jesus Christ of Latter-day Saints. Before and after his mission he played for Godoy Cruz.
He played with the team in the Argentine Primera until 2009, when he dropped down a division to play for Independiente Rivadavia one season on loan. He returned to Godoy Cruz in 2010, but was immediately loaned to Atlético de Rafaela. He has played for Gimnasia de Jujuy, SC Pacifico, Huracan San Rafael, Deportivo Maipu, Union Villa Krause, Deportivo Espanol, and Juventud Unida Universitario. He retired in 2018.