Osvaldo Mércuri was an Argentine politician, based in Buenos Aires Province, and member of the Justicialist Party. He was a longtime member of the Buenos Aires Province Chamber of Deputies from 1985 to 2005. This included two tenures as the President of the Buenos Aires Province Chamber of Deputies: 7 December 1989, to 8 December 1997, and again from 7 December 2001, until 10 December 2005. Mércuri also chaired the national 1994 Constitutional Reform Convention and the Justicialist Party conference.