Alexander James O'Connor (born 4 May 1998), known professionally as Rex Orange County, is an English singer, songwriter and multi-instrumentalist. NPR Music's Zoë Jones has described O'Connor's music as "a bright blend of hip-hop, jazz, and bedroom pop".

Teaching himself how to produce his own music at the age of 16, he released his debut album, Bcos U Will Never Be Free (2015), free of charge on Bandcamp and Soundcloud. O'Connor then released numerous solo singles throughout 2016 and 2017, including the platinum-certified singles, "Sunflower" and "Best Friend", and then released his second studio album, Apricot Princess (2017). After catching the attention of Tyler, the Creator with Bcos U Will Never B Free, they collaborated on two songs from Tyler's fourth album, Flower Boy (2017), which caused O'Connor to rise to prominence, allowing him to sign with RCA Records.

O'Connor released his third studio album, Pony (2019), lyrically exploring more personal topics, such as human emotion, and experimenting with different genres. The album became his first to enter the Billboard 200, peaking at number three on the chart. His fourth studio album, Who Cares? (2022), topped the United Kingdom, and reached number five on the Billboard 200.