"Deja Vu" is a song by American musician Post Malone featuring Canadian singer Justin Bieber. It was released through Republic Records, as the fourth single from the former's debut studio album, Stoney (2016). The first collaboration between the two artists, they wrote the song alongside Matthew Tavares, Kaan Güneşberk, FKi 1st, Louis Bell, Carl Rosen, Julkeyz, and producers Frank Dukes and Vinylz.
Upon its release, the single charted at number 75 on the Billboard Hot 100 in the United States. It also topped the New Zealand Heatseekers charts, and made charts in Canada, France, the Netherlands, Scotland, Switzerland, and the United Kingdom, peaking within the top 20 in Sweden. It would later be certified 2× Platinum in Australia, Canada, and New Zealand, and was certified Platinum in the United States.