Joost Klein (Dutch pronunciation: [joːst klɛin]; born 10 November 1997), known mononymously as Joost, is a Dutch musician, rapper, singer and former YouTuber. Mainly a hip hop artist, his songs and performances often include influences of electronic music, such as drum and bass, hardstyle and gabber. He has released eight studio albums, two of which reached the top ten of the Dutch Album Top 100. He has amassed four chart entries on the Dutch Top 40, and is best known for "Scandinavian Boy", "Wachtmuziek" and "Friesenjung".
He is set to represent the Netherlands in the Eurovision Song Contest 2024 with the song "Europapa", which became his first song to top the Dutch Single Top 100.
Klein was born on 10 November 1997 in Leeuwarden, Friesland and grew up in the nearby village of Britsum. In 2008, he started a YouTube channel under the name EenhoornJoost (lit. 'UnicornJoost'). He attended the Stedelijk Gymnasium in Leeuwarden, but did not complete the curriculum. At the age of twelve, he lost his father to cancer. A year later, in 2011, his mother died of a cardiac arrest. Following the death of his parents, Klein was looked after by his older brother and sister.