Ignacio Martín Fernández (Spanish pronunciation: [iɣˈnasjo feɾˈnandes]; born 12 January 1990) is an Argentine footballer who plays as a midfielder for River Plate.

[8] Throughout the 2016 season, he established himself in Marcelo Gallardo's team, forming a midfield line alongside Leonardo Ponzio, Andrés D'Alessandro and Pity Martínez.

[16] The transfer fee was a reported US$ 6 million, placing it as a joint-record signing for the club, alongside the deals for Yimmi Chará and Matías Zaracho.

[21] In the final stretch of the Série A and the Copa do Brasil, after facing a series of muscle injuries coupled with the consolidation of Diego Costa in the starting lineup, Fernández was restricted mainly to making second half appearances.

[22] Despite this, his overall contribution to Atlético's domestic treble winning season, with 10 goals and 11 assists in 52 games, earned him nominations to both the Prêmio Craque do Brasileirão and Bola de Prata awards.

[26] He made his international debut in a friendly win against Singapore on 13 June, coming off the bench in the 75th minute and assisting an Ángel Di María goal to complete the 6–0 score.