Lautaro Daniel Giannetti (born 13 November 1993) is an Argentine professional footballer who plays as a centre-back for Serie A club Udinese.

Giannetti debuted professionally for Vélez Sarsfield in the 2012 Clausura under Ricardo Gareca's coaching, starting in a 0–2 defeat to Argentinos Juniors.^[1] The defender was part of the squads that won the 2012 Inicial, 2012–13 Superfinal and 2013 Supercopa Argentina, although he did not play any games.

Giannetti became a starter for the team during the second half of the 2015 Argentine Primera División season, in which he started in all 15 games.^[2] He scored his first professional goal in the 12th fixture of the 2016 Argentine Primera División, a last-minute winner against Argentinos Juniors.^[3]

On 6 January 2024, Giannetti signed a one-and-a-half-year contract with Serie A team Udinese, with an option for a further year.^[4]

Giannetti was part of the squad of the Argentina national under-20 football team that played the 2013 South American Youth Championship.

In 2016, the defender was selected by coach Gerardo Martino for the preliminary squad of the Argentina national under-23 football team to participate in the Summer Olympics. He was later confirmed by Martino's successor Julio Olarticoechea and started in all three games of the team in the tournament.^[5][6]

Vélez Sársfield

• Argentine Primera División: 2012 Inicial, 2012–13 Superfinal
• Supercopa Argentina: 2013