Ramón Ángel Díaz (Spanish pronunciation: [raˈmon ˈaŋxel ˈdi.as]; born 29 August 1959) is an Argentine football manager and former player.

In 1983, Díaz joined Avellino initially on loan, being a regular starter during his three-season spell and scoring 11 goals in the 1985–86 campaign.

[2] On 21 July 1988, Díaz agreed to a loan deal with Internazionale as a replacement to Rabah Madjer, which had failed his medical.

[3] Despite scoring 15 goals overall in the season, being the club's second-best goalscorer (only behind Aldo Serena), he was not purchased by Inter and subsequently replaced by Jürgen Klinsmann.

[4] Díaz was on the Argentina under-20 team that won the 1979 FIFA World Youth Championship, alongside Diego Maradona.

However, this was denied by Maradona in his autobiography Yo soy el Diego, claiming that he had told the then-Argentina manager, Carlos Bilardo, that he wanted Diaz in both the 1986 and 1990 World Cup squads.

[8] He won another league title (the 2002 Clausura Tournament), but was replaced by Manuel Pellegrini on 20 May 2002, as the club opted to not renew his contract.

[9] On 9 December 2004, Díaz replaced Graham Rix as manager of English League Two club Oxford United.

[10] At the time, Díaz told the media: "I like English football and I wanted to get first-hand experience of it...I'd seen plenty of it on television...

Despite qualifying San Lorenzo to the 2008 Copa Libertadores, Díaz's side were knocked out by champions LDU Quito in May, and he resigned from the club on 28 May.

In the start of the Clausura 2009 season, Díaz won against Santos Laguna 2–1, drew against Toluca 2–2, and lost against Morelia 1–0 and Pachuca 3–1.

[16] On 25 May 2010, it was made official by San Lorenzo president Savino that Díaz was appointed manager for the second time, after agreeing to a one-year contract.

He was also in charge of the nation in the Copa América Centenario, where Paraguay were eliminated in the group stage, by drawing against Costa Rica and losing to Colombia 2–1 and the US 1–0.

On 21 August, Díaz made Al-Hilal draw against Al Ain 0–0 in the 2017 AFC Champions League quarter finals.

[44] On 11 September, Díaz made Al-Hilal qualify to the semi-final of the AFC Champions League after beating Al-Ain 3–0.

On 18 November, Díaz and his team drew in the first leg of the final of the AFC Champions League against Urawa Red Diamonds 1–1 in Riyadh.

[55] He subsequently returned to his home country to make an emergency surgery to remove a tumor,[56] and his absence was prolonged due to his clinical condition.

On 14 February 2022, Díaz was named as the new coach of Saudi Professional League club Al Hilal until the end of the season.

[60] However, he later led Al Hilal to defeat Flamengo 3–2 in the 2022 FIFA Club World Cup semi-finals,[61] before losing the final 3–5 against Real Madrid.

[62] In the 2022 AFC Champions League final, his team lost 2–1 on aggregate against Urawa Red Diamonds for the second time after 2017.

[63] After winning the King Cup final against Al-Wehda in May 2023, Díaz decided to step down from his post and return to his country, in order to be with his family following the death of his wife two months earlier in a car accident; meanwhile, his son Emiliano became the caretaker manager of the club for the rest of the season.

[64] On 15 July 2023, Díaz returned to Brazil after being announced as head coach of Vasco da Gama in the top tier.