Marcelo Alejandro Horacio Guinle (born 1947-09-28) is an Argentine Justicialist Party politician, currently a senator for Chubut Province.
Guinle became a lawyer and worked as a legal advisor to petrol firm YPF from 1974 to 1979. He was a judge and sat on the Comodoro Rivadavia circuit as a civil, commercial and labour judge and on the chamber of appeals of both Trelew and Comodoro Rivadavia. In 1986 he became government secretary of the municipality of Comodor Rivadavia.
In 1987 Guinle was appointed minister of government, education and justice of Chubut Province, where he served until 1989. In 1994 he was elected to the National Constitutional Covention to reform the Constitution of Argentina and in 1995 he was elected Mayor of Comodoro Rivadavia. In 1999 he was the Justicialist candidate for governor of Chubut Province but lost to Jose Luis Lizurume.
In 2001 Guinle was elected as minority national senator for Chubut. He was re-elected for a six-year term in 2003 with 47% of the vote. In December 2003 he became provisory President of the Senate, and thus third in line to the Presidency of the Republic. He left the post on 2006-02-22. He sits in the Front for Victory bloc of President Nestor Kirchner.
Guinle is married to Lilia Castillo and has three sons and three grandsons.
