"Up Down" is a song written by Michael Hardy, Brad Clawson, and CJ Solar, and recorded by American country music singer Morgan Wallen along with country music duo Florida Georgia Line. The song is Wallen's second single release overall, and it appears on his 2018 studio album If I Know Me. "Up Down" has reached number one on the Billboard Country Airplay chart and number five on the Hot Country Songs chart. It also reached number 49 on the Hot 100 chart. The song was certified 5× platinum by the Recording Industry Association of America (RIAA), and has sold 267,000 units as of August 2018. It achieved similar chart success in Canada, reaching number one on the Canada Country chart.