Park Jae-sang (Korean: 박재상, IPA: [pɐk̚.t͡ɕεsɐŋ]; born December 31, 1977), better known by his stage name Psy (싸이; SY), is a South Korean rapper and singer-songwriter. Known domestically for his humorous music videos and performances and internationally for his hit single "Gangnam Style", he has received numerous accolades, including an American Music Award, ten MAMA Awards, and a World Music Award.

Psy debuted with his first studio album Psy from the Psycho World! to mixed reviews from critics, who criticized its inappropriate content. In 2010, he signed with YG Entertainment, where he released his breakthrough single "Gangnam Style" in 2012. The song and its accompanying music video became a worldwide viral phenomenon following its release; the music video became the first video on YouTube to reach 1 billion views and was the most-viewed video on YouTube for nearly five years before being surpassed by the video for "See You Again" by Wiz Khalifa, and holds the record for the most days spent at the top spot. He followed this with his single "Gentleman", which was the most-viewed YouTube video in its first 24 hours at the time. In 2018, he founded his talent agency P Nation, where he released his studio album Psy 9th in 2022, supported by the lead track "That That".