Gerónimo Rulli (হেরোনিমো রুলি) is an Argentine footballer who plays as a goalkeeper for Ligue 1 club Marseille and the Argentina national team.

Rulli joined Estudiantes's youth team in 2009, making his professional debut for them in 2013. Between 2014 and 2020, he played for Real Sociedad, twice on loan before joining them on a permanent deal in 2017. He played in 170 matches for Sociedad in five seasons. He joined French club Montpellier on loan in 2019. In 2020, he joined Villarreal staying at the club for two-and-a-half seasons, winning the UEFA Europa League in 2020–21.

Rulli featured for Argentina in the 2016 Olympic tournament in Brazil. In May 2017, he received his first call-up for the Argentina national team. He made his international debut in 2018 against Guatemala in a 3–0 friendly win. Though he did not play any minutes, Rulli was a member of the Argentina squads that won the 2022 FIFA World Cup and the 2024 Copa América.

On 20 March 2015, Rulli was called up to the Argentina national team for the matches against El Salvador and Ecuador, but he did not play in either fixture. In 2016, Rulli was included in the preliminary squad for Copa América Centenario but was eventually excluded.

Rulli was chosen as the overage player for the Argentina Olympic squad at the 2016 Olympic tournament in Brazil. He played all three games in a group stage elimination, and filled in for the suspended Víctor Cuesta as captain in the last of those, a 1–1 draw with Honduras. After Jorge Sampaoli took charge in May 2017, Rulli was consistently called up to Argentina's senior squad, but did not play. Under manager Lionel Scaloni, he made his first team debut against Guatemala on 8 September 2018, in a 3–0 friendly win in Los Angeles.

On 1 June 2022, Rulli remained as an unused substitute as Argentina won 3–0 against reigning European Champions Italy at Wembley Stadium in the 2022 Finalissima.

He was named in Argentina's final 26-man squad for the 2022 FIFA World Cup in Qatar by Scaloni. He did not play a single minute in the tournament as Argentina won the World Cup by defeating France 4–2 in a penalty shoot-out to win the final.