Cristian Gabriel Romero is an Argentine professional footballer who plays as a centre-back for Premier League club Tottenham Hotspur and the Argentina national team.

Having joined the youth team in 2014, Romero was promoted to Argentine Primera División side Belgrano's first team in 2016; his debut came on 28 August, in a league match with Independiente. One month later, Romero played in both of Belgrano's 2016 Copa Sudamericana round of 16 draws against Coritiba. In two seasons with Belgrano's first-team, he made nineteen appearances in all competitions.

In July 2018, Romero joined Genoa of Serie A. He scored his first senior goal in his second Genoa match, netting in a 2–2 draw with Udinese on 28 October, only to be sent off later. On 9 July 2019, Juventus announced Romero was having a medical ahead of a requested transfer.

Romero has represented Argentina at the U20 level, winning seven caps at the 2017 South American U-20 Championship in Ecuador. In April 2017, he was called up for Argentina's training camp ahead of the 2017 FIFA U-20 World Cup in South Korea but was not selected on the tournament squad list. Romero was called up for the U23s in September 2019.

On 3 June 2021, Romero debuted for the senior national team a World Cup qualifier against Chile, playing the full match. In his second game for Argentina on 8 June, he scored his first international goal, coming from a thumping header against Colombia after only 130 seconds. This goal also broke the record for the fastest ever scored for Argentina in a professional match, surpassing Diego Maradona's goal after 168 seconds against Venezuela in 1985.