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Istvan Kausz
Istvan Kausz (Kausz István, 1932–2020), Hungarian épée fencer and physician; Olympic team épée gold at Tokyo 1964 and 1959 world team champion, later Olympic sports doctor.
Istvan Kovacs
Istvan Kovacs (Kovács István, born 1970, Budapest), nicknamed Ko-Ko, Hungarian boxer; flyweight bronze 1992 and bantamweight gold 1996 Olympics, WBO featherweight world champion 2001, later WBO Vice-President and IBA Secretary General.
Istvan Kozma
Istvan Kozma (1939–1970), nicknamed Pici, Hungarian Greco-Roman heavyweight wrestler, two-time Olympic champion (Tokyo 1964, Mexico City 1968), three-time world champion, only Hungarian wrestler with two Olympic golds; died in a traffic accident.
Istvan Majoros
Istvan Majoros (István Majoros, born 1974, Budapest) is a Hungarian Greco-Roman wrestler, 2004 Athens Olympic champion at 55 kg, 2000 European champion, 2005 world bronze medalist, later a national coach.
István Osztrics
István Osztrics (Osztriga), Hungarian épée fencer born 1949 in Budapest; 1972 Munich Olympic team épée gold, 1978 world team champion, 1976 Montreal fourth in individual and team; later a dentist in Heidenheim, Germany as Dr. Stephan Ostritsch.
Ivan Bogdan
Ivan Bogdan (Іван Гаврилович Богдан, 1928–2020), Soviet Ukrainian Greco-Roman heavyweight wrestler; Olympic gold at Rome 1960 (+87 kg) and World champion 1958 and 1961; not the footballers or armwrestlers of the same name.
Ivan Drago
Ivan Drago is the fictional Soviet boxer played by Dolph Lundgren in Rocky IV (1985), billed 'The Siberian Express'; he kills Apollo Creed in Las Vegas, loses to Rocky in Moscow, and returns training son Viktor in Creed II (2018).
Ivan Koloff
Ivan Koloff, ring name of Canadian Oreal Donald Perras (1942-2017), was a Soviet-billed wrestling heel who ended Bruno Sammartino's seven-year WWWF title reign on January 18, 1971, and joined the WWE Hall of Fame in 2025.
Ivan Piddubny
Ivan Piddubny (Іван Піддубний, 1871–1949) was a Ukrainian professional wrestler and circus strongman, six-time world champion in Greco-Roman wrestling, billed as the "Champion of champions".
Ivan Putski
Ivan Putski (Józef Bednarski, born 1941, Kraków) is a Polish-American professional wrestler, "Polish Power," WWF World Tag Team Champion with Tito Santana in 1979, 1978 World's Strongest Man competitor, and 1995 WWE Hall of Fame inductee.
Ivan Yarygin
Ivan Yarygin (Иван Ярыгин), Soviet heavyweight freestyle wrestler, two-time Olympic champion (1972, 1976), 1973 world champion, later USSR head coach and Russian federation president; namesake of the Krasnoyarsk Yarygin Grand Prix.
Ivar Johansson
Ivar Valentin Johansson (1903-1979), Swedish wrestler, IK Björnen Norrköping. Won three Olympic wrestling golds (1932 freestyle middleweight, 1932 Greco-Roman welterweight, 1936 Greco-Roman middleweight) and nine European titles; never wrestled at Worlds.
Ivaylo Mustafov Hristov
Ivaylo Mustafov Hristov (Ивайло Маринов, born Ismail Mustafov) is a Bulgarian light-flyweight boxer, born 1960 in Varna, who won Olympic bronze at Moscow 1980 and gold at Seoul 1988, and was named Bulgaria's best boxer of the 20th century.
Ivelisse Vélez
Ivelisse Vélez (Ivelisse Milagro Vélez, born 1987), also known as Sofia Cortez and La Sicaria, is a Puerto Rican professional wrestler; two-time SHINE Champion, two-time Lucha Underground Trios Champion, and former WWE NXT, TNA, and AEW talent.
Ivet Goranova
Ivet Goranova (Ивет Горина) is a Bulgarian karateka from Pleven, who won the 2020 Tokyo Olympics gold medal in the women's under 55 kg kumite category.
Ivory (wrestler)
Ivory (Lisa Mary Moretti, born 1961), also Tina Ferrari in GLOW, American retired professional wrestler; three-time WWE Women's Champion 1999-2005, Right to Censor member, 2018 WWE Hall of Fame inductee.
Ivy Nile
Ivy Nile (Emily Andzulis, born 1992, Knoxville, Tennessee) is an American WWE Raw wrestler nicknamed The Pitbull, first female Titan Games champion, Diamond Mine and American Made member, known for the Diamond Chain Lock dragon sleeper.
IWGP Global Heavyweight Championship (IWGPグローバルヘビー級王座)
IWGP Global Heavyweight Championship (IWGPグローバルヘビー級王座), NJPW secondary men's heavyweight title created December 11, 2023 to replace the IWGP US Championship; David Finlay inaugural champion, Gabe Kidd current two-time champion.
IWGP Heavyweight Championship (IWGPヘビー級王座)
IWGP Heavyweight Championship (IWGPヘビー級王座), NJPW's men's world heavyweight title, established June 12, 1987 with Antonio Inoki as first champion, unified into the IWGP World title in 2021 and reactivated in 2026; current champion Yota Tsuji.
IWGP Intercontinental Championship
IWGP Intercontinental Championship (IWGPインターコンチネンタル王座), NJPW secondary men's singles title 2011-2026. Inaugural champion MVP; unified into IWGP World Heavyweight 2021; retired January 6, 2026 by final champion Yota Tsuji.
IWGP Junior Heavyweight Championship
The IWGP Junior Heavyweight Championship is a professional wrestling title owned by New Japan Pro-Wrestling, contested among junior heavyweights under 100 kg (220 lb) since 1986.
IWGP United States Heavyweight Championship
IWGP United States Heavyweight Championship (IWGP USヘビー級王座), a secondary NJPW men's heavyweight wrestling title established May 12, 2017; Kenny Omega first champion, Will Ospreay final champion, succeeded by the IWGP Global Heavyweight Championship.
IWGP World Heavyweight Championship
IWGP World Heavyweight Championship (IWGP世界ヘビー級王座), NJPW's top title 2021-2026, created by unifying the IWGP Heavyweight and Intercontinental Championships; Kota Ibushi inaugural champion, 15 champions, deactivated January 2026 when Yota Tsuji revived the IWGP Heavyweight title as its 87th champion.
Iwo Baraniewski
Iwo "Rudy" Baraniewski, Polish UFC light heavyweight born 1998 in Warsaw, judo black belt, Contender Series graduate. 9-1 pro record with 7 KO/TKO wins; first loss a split decision to Alonzo Menifield at UFC 331, September 2026.
Iyo Sky
Iyo Sky (Masami Odate), formerly Io Shirai, Japanese WWE wrestler, The Genius of the Sky. Stardom's first holder of all five titles; WWE Women's Champion 2023, two-time Women's World Champion, 2026 Queen of the Ring.
Izzi Dame
Izzi Dame (Franki Strefling, born 1999) is an American WWE NXT wrestler, former Eastern Michigan volleyball player, member of The Culling, and former NXT Women's North American Champion (January to March 2026).
J-Rod (wrestler)
J-Rod (Jessica Roden, born 1992) is an American independent professional wrestler, "The Ultimate Athlete" and former American Gladiator Supernova, known for OVW, JCW Women's Championship, and TJPW title challenges.
Jack Brisco
Jack Brisco, born Freddie Joe Brisco, was an American professional wrestler and two-time NWA World Heavyweight Champion in the 1970s, inducted into the WWE Hall of Fame in 2008.
Jack Cartwheel
Jack Cartwheel (Jack Cartwright, also Jack Summit), American high-flying wrestler born 2000 in Sacramento; debuted 2019, GCW regular, WWE ID/Evolve 2024, Demand Lucha and SPW champion, AAA full-time from 2026.
Jack Catterall
Jack Catterall, Chorley southpaw super lightweight boxer; lost his 2022 undisputed title bid to Josh Taylor by disputed split decision, avenged it in 2024, and later won the WBA world title.