Marcelo Alejandro Horacio Guinle (September 28, 1947 – June 8, 2017) was an Argentine Justicialist Party politician. He served as a Senator for Chubut Province from 2001 through 2015. He was born in Santa Fe, Argentina. From 2003 through 2006, he served as Provisional President of the Argentine Senate. Before serving in the senate, Guinle served as Mayor of Comodoro Rivadavia from 1995 through 1999.