Ignacio Piatti (born 4 February 1985 in General Baldissera, Córdoba) is an Argentine football midfielder. He currently plays for San Lorenzo de Almagro in the Argentine Primera División. He is a skilled dribbler who usually plays on the right side of midfield.
Piatti has played professional football in Europe with Saint-Étienne and Lecce. In Argentina, he has played for Talleres, Chacarita Juniors, Gimnasia LP, and Independiente.
On 17 August 2012 Piatti signed for San Lorenzo de Almagro for a reported fee of €1 million. He debuted against Colon de Santa Fe in the sixth match of Torneo Inicial 2012, Ignacio was the player of the match.