UFC Fight Night 149: Overeem vs. Oleinik was a mixed martial arts event produced by the Ultimate Fighting Championship held on April 20, 2019, at Yubileyny Sports Palace in Saint Petersburg, Russia. A heavyweight bout between the 2010 K-1 World Grand Prix Champion and former Strikeforce Heavyweight Champion Alistair Overeem and Aleksei Oleinik served as the event headliner.