Celso Alejandro Jaque (born September 24, 1960) is an Argentine Justicialist Party (PJ) politician, former Argentine Ambassador to Colombia, former governor of Mendoza Province and a former senator.

Born in Malargüe, Mendoza, Jaque graduated as an accountant at the National University of Cuyo.

He was elected Governor of Mendoza in October 2007, replacing Julio Cobos, who was elected Vice President of Argentina.

The governor of the fourth most important district in Argentina, Jaque's support was courted by the faction of the Justicialist Party opposed to Kirchnerism.

He remained an ally, however, of the embattled President Cristina Kirchner, who lost the support of Vice President Cobos and most Mendoza Justicialists during the 2008 Argentine government conflict with the agricultural sector.