This is a sub-list from List of doping cases in sport representing a full list of surnames starting with K.
| Name | Country | Event | Banned substance(s) | Reference(s) |
|---|---|---|---|---|
| Alina Kabaeva |
 Russia
|
Rhythmic gymnastics | Furosemide | |
| Alimuddin Kakar |
 Pakistan
|
Weightlifting | ||
| Georgios Kalogeropoulos |
 Greece
|
Swimming | Cannabis | |
| Mohamed Kallon |
 Sierra Leone
|
Football (soccer) | Nandrolone | |
| Kaspars Kambala |
 Latvia
|
Basketball | Cocaine metabolite | |
| Ruslan Kapaev |
 Kyrgyzstan
|
Weightlifting | ||
| Tovmasjan Karen |
 Netherlands
|
Weightlifting | Metandienone | |
| Rogerio Karfunkelstein |
 Brazil
|
Swimming | Stanozolol | |
| Faisal Karim |
Pakistan
|
Boxing | Cannabis | |
| Nauman Karim |
Pakistan
|
Boxing | ||
| Mario Kasun |
 Croatia
|
Basketball | Cathine | |
| Sesil Karatantcheva |
 Bulgaria
|
Tennis | Nandrolone | |
| Svend Karlsen |
 Norway
|
Strongmen | ||
| Mohd Karmand |
 Afghanistan
|
Weightlifting | Methandienone | |
| Samko Karol |
 Slovakia
|
Weightlifting | Drostanolone | |
| Fetie Kasaj |
 Albania
|
Weightlifting | (in Norwegian) | |
| Vasiliki Kasapi |
Greece
|
Weightlifting | Methyltrienolone, Buprenorphine | |
| Andrey Kashechkin |
 Kazakhstan
|
Cycling | Blood doping | |
| Asmaa Kataria |
 Egypt
|
Swimming | Ephedrine | |
| Gursharanpreet Kaur |
 India
|
Wrestling | Methylhexaneamine | |
| Valeriya Kaverina |
Russia
|
Weightlifting | Metandienone | |
| Devi Kavita |
India
|
Weightlifting | Metandienone | |
| Valery Kaykov |
Russia
|
Cycling | GW501516 | |
| Kboi |
 Vietnam
|
Weightlifting | Testosterone, Epitestosterone | |
| Zoltan Kecskes |
 Hungary
|
Weightlifting | ||
| Ronwin Kelly |
 South Africa
|
Rugby union (former bodybuilder) | Nandrolone | |
| Robert Kendrick |
 United States
|
Tennis | Methylhexaneamine | |
| Daniel Kenedy |
 Portugal
|
Football (soccer) | Furosemide | |
| Paddy Kenny |
 Ireland
|
Football (soccer) | ephedrine | |
| David Kerkhoffs |
 Belgium
|
Swimming | Cannabinoids | |
| Jason Kerr |
 Canada
|
Bobsleigh | Boldenone, nandrolone, testosterone, trenbolone | |
| Paul-Alain Kersale |
 France
|
Swimming | Cannabinoids | |
| Matthias Kessler |
 Germany
|
Cycling | Testosterone | |
| El Maoui Khalil |
 Tunisia
|
Weightlifting | Methylhexaneamine | |
| Naglaa Hamed Khallaf |
Egypt
|
Weightlifting | Stanozolol | |
| Vitaliy Khan |
Kazakhstan
|
Swimming | Cannabis | |
| Masuam Khatri |
India
|
Wrestling | Methylhexaneamine | |
| Praeonapa Khenjantuek |
 Thailand
|
Weightlifting | Metandienone | |
| Nan Aye Khine |
 Myanmar
|
Weightlifting | Steroids | |
| Natalia Khlestkina |
 Romania
|
Weightlifting | Metenolone | |
| Bahodur Kholov |
 Tajikistan
|
Weightlifting | Nandrolone | |
| Yaroslav Khoma |
 Ukraine
|
Football (soccer) | ||
| Albina Khomich |
Russia
|
Weightlifting | Anabolic steroids | |
| Yekaterina Khoroshikh |
Russia
|
Hammer throwing | ||
| Natalya Khudyakova |
Ukraine
|
Swimming | Stanozolol | |
| Oksana Khvostenko |
Ukraine
|
Biathlon | ||
| Zbyszko Kienast |
 United Kingdom
|
Weightlifting | Testosterone | |
| Rotson Kilambe |
 Zambia
|
Football (soccer) | Cannabis | |
| Kazbek Kilou |
 Belarus
|
Wrestling | Metenolone | |
| Igor Kim |
Kazakhstan
|
Weightlifting | Furosemide, T/E 21.4 | |
| Kim Jong Su |
 North Korea
|
Shooting | Propanolol | |
| Hyang Kim |
North Korea
|
Weightlifting | Methyltestosterone, Methandriol | |
| Gerard Kinsella |
 England
|
Football (soccer) | Nandrolone | |
| Gergana Kirilova |
Bulgaria
|
Weightlifting | Steroids | |
| Harri Kirvesniemi |
 Finland
|
Cross-country skiing | HES | |
| Karolin Kittel |
Germany
|
Swimming | Refusal to submit to doping test | |
| Steffen Kjærgaard |
Norway
|
Cycling | ||
| Boonnatee Klakasikit |
Thailand
|
Weightlifting | Methandienone | |
| Rory Kleinveldt |
South Africa
|
Cricket | Marijuana | |
| Ivan Klim |
Belarus
|
Weightlifting | Stanozolol | |
| Vitali Klitschko |
Ukraine
|
Boxing | Anabolic steroids (self-admitted) | |
| Kasem Knakri |
 Syria
|
Weightlifting | ||
| Tonya Knight |
United States
|
Bodybuilding | Using a stand-in when chosen for a random drug test | |
| Bernhard Kohl |
 Austria
|
Cycling | CERA | |
| Francis Kombe |
Zambia
|
Football (soccer) | Cannabis | |
| Anton Komlev |
Russia
|
Swimming | ||
| Izabela Kondraszuk |
 Poland
|
Gymnastics | Dimethylpentylamine | |
| Yoann Kongolo |
 Switzerland
|
Kickboxing | Methandrostenolone and stanozolol | |
| Mouhanad Korabi |
Syria
|
Weightlifting | Stanozolol, Metenolone, Methyltestosterone | |
| Olha Korbka |
Ukraine
|
Weightlifting | Methandienone | |
| Petr Korda |
 Czech Republic
|
Tennis | Nandrolone | |
| Juha Korhonen |
Finland
|
Swimming | Cannabis | |
| Andrey Korneyev |
Russia
|
Swimming | Bromantan | |
| Chris Korol |
Canada
|
Bobsleigh | ||
| Ekaterina Koroleva |
Russia
|
Cycling | ||
| Anzhelika Kotyuga |
Belarus
|
Speed skating | Anabolic steroids | |
| Eleni Kourtelidou |
Greece
|
Weightlifting | Methyltrienolone, Buprenorphine | |
| Nikos Kourtidis |
Greece
|
Weightlifting | ||
| Zoltán Kovács |
Hungary
|
Weightlifting | Refusal to provide test | |
| Justyna Kowalczyk |
Poland
|
Cross-country skiing | Dexamethason | |
| Kateryna Kozlova |
Ukraine
|
Tennis | 1,3-Dimethylbutylamine | |
| Nina Kraft |
Germany
|
Triathlon | Erythropoietin (EPO) | |
| Natascha Kraus |
Germany
|
Swimming | Reproterol | |
| Daniel Kreutzer |
Germany
|
Ice hockey | Missed test | |
| Tobias Kreuzmann |
Germany
|
Swimming | Finasteride | |
| Lennie Kristensen |
 Denmark
|
Cycling | ||
| Ante Krizan |
Croatia
|
Swimming | Methylhexaneamine | |
| Lubos Krizko |
Slovakia
|
Swimming | Tamoxifen | |
| Karen Kronemeyer |
Netherlands
|
Squash | Benzylpiperazine | |
| Stein Olav Krosby |
Norway
|
Speed skating, long track | Testosterone | |
| Roman Kryklia |
Ukraine
|
Kickboxing | Meldonium, clenbuterol | |
| Andrey Krylov |
Russia
|
Gymnastics | THC | |
| Herkie Kruger |
South Africa
|
Rugby union | Nandrolone | |
| Vasyl Kruk |
Ukraine
|
Weightlifting | Stanozolol, testosterone | |
| Ondrej Kruzel |
Slovakia
|
Weightlifting | Drostanolone | |
| Virpi Kuitunen |
Finland
|
Cross-Country skiing | ||
| Galina Kulakova |
Russia
|
Cross-Country skiing | Ephedrine | |
| Pavel Kulizhnikov |
Russia
|
Speed skating | Methylhexanamine, Meldonium | |
| Sumit Kumar |
India
|
Wrestling | Methylhexanamine | |
| Saliya Kumara |
 Sri Lanka
|
Rugby union | Methylhexanamine | |
| Pratima Kumari |
India
|
Weightlifting | ||
| Ouyang Kunpeng |
 China
|
Swimming | Clenbuterol | |
| Dimitar Kutrovsky |
Bulgaria
|
Tennis | ||
| Alexi Kutsenko |
Russia
|
Swimming | Testosterone | |
| Ruza Kuzieva |
 Uzbekistan
|
Powerlifting | Methandienone | |
| Albert Kuzilov |
 Georgia
|
Weightlifting | Metandienone | |
| Zhassulan Kydyrbayev |
Kazakhstan
|
Weightlifting | Stanozolol | |
| Artur Kyshenko |
Ukraine
|
Kickboxing |