Juan Ignacio Díaz (born 26 May 1998) is an Argentine professional footballer who plays as a full-back for Chilean Primera División club O'Higgins.

[3][4] Having sat on the bench for the entirety of a 3–0 loss in Primera División away to San Martín on 4 February 2019, Díaz was selected by Leandro Benítez for his professional bow days later in a fixture with Patronato at the Estadio Ciudad de La Plata.

[1] In August 2020, after not featuring in 2019–20, Díaz was loaned to Primera B Nacional with Agropecuario.

[6][7] In January 2022, Díaz joined Barracas Central on a one-year loan.

[8] In 2024, he moved to Chile and joined O'Higgins in the top division.