"Rockstar" is a song by American rapper Post Malone. It was released on September 15, 2017, by Republic Records as the first single from his upcoming project Beerbongs & Bentleys. The track features a guest verse from fellow American rapper 21 Savage, and was produced by Tank God and Louis Bell (who co-produced his hit single "Congratulations"). It was written by Post Malone, 21 Savage, Louis Bell and Olufunmibi Awoshiley. The track peaked at number two on the US Billboard Hot 100, becoming his highest peaking single on the chart, surpassing the number eight peak of his 2017 hit, "Congratulations". The song also peaked at number one in several countries, including the United Kingdom.

Post Malone posted a snippet of himself recording the track in the studio via Twitter on December 29, 2016.

The song debuted at number two on the US Billboard Hot 100 behind Cardi B's "Bodak Yellow", breaking the single week streaming record on Apple Music with over 25 million streams becoming Post Malone's third top 20 hit, following his debut single, "White Iverson" and his top 10 hit "Congratulations".

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