Park Young-seok (Korean: ???; Hanja: ???: November 2, 1963 – October 2011 on Annapurna) was a South Korean mountaineer.
In May 2005, he became the first person in the world to complete an Explorers Grand Slam.
He climbed the world's 14 Eight-thousanders, the Seven Summits, and trekked to both poles.
He holds the world's third fastest time (behind Kim Chang-ho of South Korea and Jerzy Kukuczka of Poland) for ascending the 14 Eight-thousanders, the Guinness World Record for climbing six of the 8,000-meter Himalayan peaks within one year, and another record for reaching the South Pole on foot in 44 days, self-sufficient and without any food re-supplies.