Luis Fernando Díaz Marulanda (born 13 January 1997) is a Colombian professional footballer who plays as a left winger or forward for Premier League club Liverpool and the Colombia national team.

[8] Díaz made his senior debut on 26 April 2016, coming on as a second-half substitute in a 2–1 Categoría Primera B home loss against Deportivo Pereira.

[11] He made his Categoría Primera A debut on 27 August, replacing Matías Mier in a 3–2 loss at Once Caldas,[12] and scored his first goal on 20 September in a 3–1 Copa Sudamericana home win against Cerro Porteño.

[13] Díaz became a regular starter during the 2018 season, and scored his first goal in the top tier on 4 February of that year, by netting the game's only in a home success over Atlético Bucaramanga.

[18] Zenit Saint Petersburg had also wanted to sign him, but he was convinced otherwise by compatriot former Porto players Radamel Falcao and James Rodríguez, as well as his then-national team coach Carlos Queiroz.

[19] He made his debut on 7 August in a 1–0 win at Krasnodar in the UEFA Champions League first qualifying round first leg as a 55th-minute substitute for Romário Baró,[20] and six days later in the return game he scored his first goal, albeit in a 3–2 loss at the Estádio do Dragão.

[21] Domestically, he made his Primeira Liga debut on 10 August in a 2–1 loss at Gil Vicente as a substitute, and a week later scored for the first to wrap up a 4–0 home win against Vitória de Guimarães as a starter.

[25] On 23 December, Díaz came on as a 77th-minute substitute for Mehdi Taremi in the 2020 Supertaça Cândido de Oliveira against O Clássico rivals Benfica, and scored to confirm a 2–0 win.

[42] On 14 May, he started in the 2022 FA Cup final against Chelsea, which Liverpool won 6–5 on penalties after a goalless draw, with Diaz being replaced by Roberto Firmino in the 98th minute, as he was named man of the match.

[44] On 30 July 2022, Díaz started for Liverpool in the club's 3–1 win over Manchester City in the FA Community Shield at the King Power Stadium.

[47] After seven months in the sidelines, Díaz made his return from injury on 17 April, replacing Cody Gakpo in the 81st minute of a 6–1 away win over Leeds United.

[54] On 5 November, in the first match he played since the kidnapping of his parents, Díaz came on as a substitute and scored a stoppage-time equaliser in a 1–1 Premier League draw away against Luton Town.

[60] After representing Colombia at under-20 level in the 2017 South American U-20 Championship, Díaz was called up to the full squad on 27 August 2018, for friendlies against Venezuela and Argentina.

[61] He made his full international debut on 11 September, replacing Juan Cuadrado in a 0–0 draw against the latter at the MetLife Stadium in East Rutherford, New Jersey.

Colombian President Gustavo Petro stated that "all the public forces have been deployed" and the following day, General William Rene Salamanca announced a reward of up to 200 million pesos for information on Díaz's father's whereabouts.

[81] In June 2024, leading up to the Copa America 2024, Díaz appeared on Colombian singer, Ryan Castro’s song “EL RITMO QUE NOS UNE”.

He also appeared in the music video alongside Colombian national team teammates, James Rodriguez and Juan Fernando Quintero who also sang in the song.