Joaquín Díaz Bonilla (born 12 April 1989) is an Argentine rugby union player.

Diaz Bonilla started at fly half for Jaguares in the 2019 Super Rugby Final, where they lost to New Zealand's Crusaders.

During the 2019 Rugby World Cup Diaz Bonilla played for Racing 92 in France's Top 14 as cover for Finn Russell and Ben Volavola.

[citation needed] On 21 September 2020 he signed for Leicester Tigers in England's Premiership Rugby,[3] he made his debut as a replacement against London Irish but played only five times before his release was announced on 16 June 2021.

[4] On 15 August 2021 Bonilla joined Sharks, based in Durban, South Africa, for their debut United Rugby Championship season.