Bouldering is a form of free climbing that is performed on small rock formations or artificial rock walls without the use of ropes or harnesses. While bouldering can be done without any equipment, most climbers use climbing shoes to help secure footholds, chalk to keep their hands dry and to provide a firmer grip, and bouldering mats to prevent injuries from falls. Unlike free solo climbing, which is also performed without ropes, bouldering problems are usually less than six metres (20 ft) tall. Traverses, which are a form of boulder problem, require the climber to climb horizontally from one end to another. Artificial climbing walls allow boulderers to climb indoors in areas without natural boulders. In addition, bouldering competitions take place in both indoor and outdoor settings.
Dai Koyamada is a Japanese rock climber and known as one of the leading boulderers of his generation who established some of the first-ever boulder problems at 8C (V15). He has also established and repeated, some of the hardest sport climbs in the world.
Val Masino is a comune (municipality) in the Province of Sondrio in the Italian region Lombardy, located about 90 kilometres (56 mi) northeast of Milan and about 20 kilometres (12 mi) northwest of Sondrio, on the border with Switzerland. As of 31 December 2004, it had a population of 962 and an area of 116.0 square kilometres (44.8 sq mi).
Simone Moro is an Italian mountaineer and alpinist known for having made first winter ascents of four of the fourteen eight-thousanders: Shishapangma in 2005, Makalu in 2009, Gasherbrum II in 2011, and Nanga Parbat in 2016. No other climber has made more first winter ascents of an eight-thousander in history. He has summited Everest four times, in 2000, 2002, 2006, and 2010.
Adam Ondra is a Czech professional rock climber, specializing in lead climbing, bouldering, and competition climbing. In 2013, Rock & Ice described Ondra as a prodigy and the leading climber of his generation. Ondra is the only male athlete to have won World Championship titles in both disciplines in the same year (2014) and is also the only male athlete to have won the World Cup series in both disciplines.
Paul David Robinson is an American professional rock climber who specializes in bouldering. He has established and repeated several bouldering problems at the V15 difficulty rating, in such areas as Hueco Tanks, the Buttermilks, and Magic Wood. In 2007, Robinson became the second climber in history to successfully climb a V13 boulder problem in one attempt.
David Lama was an Austrian rock climber and alpinist. He won the European Championship in competition bouldering in 2007 and the European Championship in competition lead climbing in 2006. He is known for his first free ascent of the Compressor Route on Cerro Torre. In 2018, in a solo expedition, he was the first to reach the summit of Lunag Ri in the Himalayas. In 2019, he was posthumously honoured with a Piolet d'Or for this first ascent.
Anna Stöhr is a professional climber. She is a champion in bouldering climbing competitions. She won four Bouldering World Cups, in 2008, 2011, 2012 and 2013 and two World Championships, in 2007 and 2011. Notably, she dominated the 2013 Bouldering World Cup series, by winning seven events out of eight, losing one just by one attempt to Juliane Wurm.
Alexey Vyacheslavovich Rubtsov is a Russian professional rock climber who specializes in competition bouldering. He has won the IFSC Climbing World Championships in the bouldering discipline in 2009. He won the 9th edition of the Melloblocco competition in 2012. At the 2020 IFSC Climbing European Championships he won the combined event, ensuring him a place at the 2020 Summer Olympics.
Ashima Shiraishi is an American rock climber. Shiraishi started climbing at the age of six at Rat Rock in Central Park, joining her father. Only a few years later, she quickly established herself as one of the top boulderers and sport climbers in the world. Her numerous accolades include first-place finishes in international competitions, and multiple first female and youngest ascents. Shiraishi is featured in several short documentary-style films, and is the subject of the documentary short "Return to the Red" (2012).
Dmitri Sarafutdinov, also known as Dmitrii Sharafutdinov, is a professional Russian rock climber and competition climber who specializes in competition bouldering. He has won three World Championships, in 2007, 2011 and 2012 and one Bouldering World Cup in 2013.
Angela "Angy" Eiter is an Austrian professional rock climber who specialises in competition climbing and sport climbing. In competition lead climbing, she won three IFSC World Cups in a row (2004–2006), and four IFSC World Championships. In 2011, she achieved her 25th win in World Cup and her 42nd podium. She is also one of the strongest sport climbers in the world, and in 2017, became the first-ever female in history to climb a 9b (5.15b) route, La Planta de Shiva. In 2020, she became the first-ever female in history to complete the first free ascent (FFA) of a 9b (5.15b) route, Madame Ching.
Mina Markovič is a professional rock climber who specialized in competition climbing, from which she is now retired. She competed in the World Cup and World Championships in competition lead climbing, competition bouldering, and competition speed climbing, obtaining her best results in lead. She also climbs on outdoor sport climbing routes where she has redpointed to 9a (5.14d).
Daniel Woods is an American professional rock climber who specializes in bouldering, and who is considered one of the most important climbers in the history of bouldering. Woods has climbed over thirty boulder problems graded at or above 8C (V15). He has also won several competition bouldering events, such as the U.S. National Bouldering Championship and some international events. In March 2021, Woods achieved the first ascent of a low start to Sleepwalker V16 (8C+) which he named Return of the Sleepwalker and proposed the grade 9A (V17), only the second-ever route in history at that grade.
Kim Ja-in, more widely known in the West as Jain Kim, is a professional climber who specializes in competition climbing. She is mainly active in competition lead climbing and competition bouldering. She has won the Lead Climbing World Cup three times, the Lead Climbing World Championship once (2014), and the Rock Master once. Moreover, she has won the Asian Championships 14 times in 15 years, namely 11 times in lead climbing and 3 times in bouldering.
Alexander Megos is a German rock climber specializing in sport climbing, bouldering and competition climbing. In 2013, he became the first-ever climber to onsight a 9a (5.14d) graded route. He has made the first free ascent (FFA) of some of the hardest sport climbing routes in the world, including two 9b+ (5.15c) routes, three 9b (5.15b) routes, and several boulders with a boulder 8C (V15) rating.
Jakob Schubert is an Austrian professional rock climber, specializing in competition climbing, sport climbing, and bouldering. He was four times World Champion and three times World Cup winner in lead climbing. In August 2021, he won bronze at the 2020 Summer Olympics in Tokyo. As of the end of 2022, Schubert had won the most men's IFSC gold medals of any male competition climber in history. In addition to competition climbing, Schubert is one of only a handful of climbers in the world to have redpointed 9c (5.15d) routes.
Stefano Ghisolfi is an Italian professional rock climber, who specializes in competition climbing, sport climbing, and bouldering. In competition climbing, he completes in competition lead climbing, competition bouldering, and competition speed climbing, with lead being his strongest discipline. As a sport climber, he has redpointed sport climbing routes of grade 9b+ (5.15c), onsighted routes of 8c (5.14b), and solved boulder problems at grade 8B+ (V14). In December 2018, after climbing Perfecto Mundo, he became the fourth climber in history to redpoint a 9b+ (5.15c) route.
Kilian Fischhuber is a professional Austrian rock climber who specializes in bouldering, sport climbing and competition climbing, where competes in bouldering and lead climbing. From 2005 to 2011, he won five Bouldering World Cups. No other male climber was ever able to win it more than three times, or win it three times in a row. Due to his outstanding career, he was awarded the La Sportiva Competition Award in 2009, together with Chris Sharma.
Christian Core is an Italian professional rock climber who specialises in bouldering and competition bouldering. He is known for being the first-ever person in the world to climb an 8C+ (V16) boulder, Gioia, in 2008. As a competition climber, Core won the Bouldering World Cup twice in 1999 and 2002, and also won the Bouldering World Championship in 2003.
Chris Sharma 
Stefania De Grandi
Anthony Lamiche
Barbara Zangerl 
Adam Ondra 
Yulia Abramchuk 
Chloé Graftiaux 
Anthony Gullsten
Shauna Coxsey 
Sachi Amma 
Janja Garnbret