Luis Alfonso Petri (born 1 April 1977) is an Argentine politician who is serving as the country's Minister of Defense since 2023 under president Javier Milei.

He studied law at the National University of the Littoral (UNL), later working as a private lawyer at his own firm.

During his time in the provincial legislature he specialized in matters of security and law and order, authoring a bill to make crimes with aggravating circumstances non-commutable.

[2] In the 2013 legislative election, Petri ran for one of Mendoza's seats in the Argentine Chamber of Deputies.

[6] On 22 June 2023, presidential hopeful Patricia Bullrich of the Republican Proposal party announced Petri would be her running mate in the 2023 presidential election, as part of the "Force of Change" list within the Juntos por el Cambio coalition.