Mark Lee (born August 2, 1999), known professionally as Mark (마크), is a Canadian rapper and singer-songwriter based in South Korea. He was a member of the South Korean boy group NCT (2016–2026) and its sub-units NCT U, NCT 127 and NCT Dream. He debuted as a member of NCT U on April 9, 2016 with the debut single "The 7th Sense". He was also a member of the supergroup SuperM, which debuted in October 2019. He announced his departure from NCT and SM Entertainment on 3 April 2026, less than week before the expiration of his contract on 8 April 2026.