Lucas Martínez Quarta (born 10 May 1996) is an Argentine footballer who plays as a centre back for Fiorentina.
A product of River Plate’s youth academy, Martínez Quarta made his professional debut for the club in November 2016. He was a member of the 2018 Copa Libertadores winning side, starting in the first leg of the final against Boca Juniors.
On 5 October 2020, Martínez Quarta signed a five-year contract with Serie A club Fiorentina.
Martínez Quarta made his debut for the Argentina national team on 5 September 2019, in a friendly 0–0 draw against Chile, playing the full 90 minutes.