UFC Fight Night 164: Błachowicz vs. Jacaré was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on November 16, 2019 at Ginásio do Ibirapuera in São Paulo, Brazil. A light heavyweight bout between former KSW Light Heavyweight Champion Jan Błachowicz and former Strikeforce Middleweight Champion Ronaldo Souza served as the event headliner.