Joaquín Matías Ardaiz de los Santos (born 11 January 1999) is a Uruguayan professional footballer who plays as a forward for Argentine club Argentinos Juniors.

[2] Promoted to the main squad ahead of the 2016 campaign,[3] he appeared in friendlies against Brazilian sides Grêmio and Cruzeiro before making his official debut on 14 February, coming on as a second-half substitute for Marcelo Saracchi in a 1–0 away loss against Cerro.

[5] The following 16 January, he was sold to a group of English investors, having 70% of his federative rights acquired; he was assigned to El Tanque Sisley, and was immediately loaned back to Danubio.

[6] On 28 August 2017, Ardaiz moved abroad for the first time in his career after agreeing to a one-year loan deal with Royal Antwerp FC.

[7] He made his debut for the club on 22 September, replacing William Owusu late into a 3–0 home win against KV Kortrijk.