Konstantin Nikolaevich Fomichev is a Russian sprint canoeist who competed from the late 1990s to the mid-2000s. He won nine medals at the ICF Canoe Sprint World Championships with four golds, three silvers, and two bronzes.
Ihar Astapkovich is a hammer thrower who won two Olympic medals, first representing the Soviet Union and later his home country of Belarus.
Konstantin Yuryevich Volkov is a retired pole vaulter.
Latvia competed at the 1928 Summer Olympics in Amsterdam, Netherlands. 17 competitors, 15 men and 2 women, took part in 14 events in 6 sports.
Konstantin Borisovich Loktev was a Soviet ice hockey player who played in the Soviet Hockey League. He played for HC CSKA Moscow. He was inducted into the Russian and Soviet Hockey Hall of Fame in 1964. He was born and died in Moscow.
Konstantin Anatolyevich Ushakov is a Russian retired volleyball player, who was a member of the Men's National Team that won the silver medal at the 2000 Summer Olympics in Sydney, Australia. Playing as a setter he won the 2002 Volleyball World League with Russia, and the 1999 World Cup. A four-time Olympian he also competed at the 2004 Summer Olympics, claiming the bronze medal.
Konstantin Stanislavovich Krizhevsky was a Russian football defender who competed for the Soviet Union at the 1952 Olympics and 1958 FIFA World Cup.
Konstantin Vyrupayev was a Soviet wrestler and Olympic Champion.
Konstantin Leonidovich Kokora is a former competitive figure skater. He is the 1979 Soviet national champion and finished 10th at the 1980 Winter Olympics.
Tahkuranna is a village in Häädemeeste Parish, Pärnu County in southwestern Estonia. It is the birthplace of Konstantin Päts, the first president of Estonia. Tiit Helmja, an Olympic rower, was also born in Tahkuranna.
Konstantin Georgiyevich Shabanov is a Russian track and field athlete who specialises in the 110 metres hurdles. He was the gold medallist in the event at the 2008 World Junior Championships in Athletics and represented his country at the 2012 Summer Olympics.
Konstantin Igropulo is a Russian-Greek handballer who plays for Wisła Płock and the Russian national team.
Konstantin Yuryevich Petrov is a retired Kazakhstani butterfly swimmer. He won a bronze medal at the 1988 Summer Olympics and a gold medal at the 1987 European Aquatics Championships in the 4 × 100 m medley relay.
Konstantin Aleksandrov is a Kyrgyzstani former wrestler who competed in the 1996 Summer Olympics.
Konstantin Sergeyevich Semenov is a Russian beach volleyball player. He competed for Russia at the 2012 Summer Olympics with his teammate Sergey Prokopyev finishing at the shared 9th place. As of August 2013 he has won one tournament in the FIVB World Tour and two in the CEV European Tour alongside two other podium spots in the World Tour. At the 2016 Summer Olympics, Semenov and his new teammate Vyacheslav Krasilnikov finished as fourth.
Konstantin Georgiev is a Bulgarian former basketball player. He competed in the men's tournament at the 1952 Summer Olympics.
Konstantin Totev was a Bulgarian basketball player. He competed in the men's tournament at the 1952 Summer Olympics and the 1956 Summer Olympics.
Konstantin Maznikov was a Bulgarian footballer. He competed in the men's tournament at the 1924 Summer Olympics.
Konstantin Mitev is a Bulgarian volleyball player. He competed in the men's tournament at the 1988 Summer Olympics.
Konstantin Korotkov is a Soviet speed skater. He competed in the men's 10,000 metres event at the 1984 Winter Olympics.
