This is a sub-list from List of doping cases in sport representing a full list of surnames starting with I.
| Name | Country | Event | Banned substance(s) | Reference(s) |
|---|---|---|---|---|
| Christos Iakovou |
 Greece
|
Weightlifting | Steroids | |
| Iryna Iarosh |
 Ukraine
|
Rowing | Numerous banned substances | |
| Jazmin Ibeth |
 Mexico
|
Weightlifting | ||
| Sarmadm Idrees |
 Iraq
|
Weightlifting | Metandienone | |
| Fernando Iglesias |
 Argentina
|
Wrestling | Clenbuterol, Furosemide | |
| Glenn Ikonen |
 Sweden
|
Wheelchair curling | ||
| Babak Imcheh |
 Iran
|
Wrestling | Norandrosterone | |
| Janne Immonen |
 Finland
|
Cross-country skiing | HES | |
| Guto Inocente |
 Brazil
|
Kickboxing | Stanozolol, anastrozole, tamoxifen and THC | |
| In Sun Hong |
 North Korea
|
Diving | Furosemide | |
| Ekaterina Iourieva |
 Russia
|
Biathlon | r-EPO | |
| Muzaffar Iqbal Mirza |
 Pakistan
|
Boxing | ||
| Yusaku Iriki |
 Japan
|
Baseball | Steroids | |
| Laurent Irish |
 United Kingdom
|
Basketball | Cannabis | |
| James Irvin |
 United States
|
Mixed martial arts | Methadone and oxymorphone | |
| Michael Irvin |
United States
|
American football | Cocaine | |
| Bala Isa |
 Albania
|
Weightlifting | ||
| Anzur Ismailov |
 Uzbekistan
|
Football (soccer) | Cannabis | |
| Gunduz Ismayilov |
 Azerbaijan
|
Powerlifting | Stanozolol | |
| Jari Isometsä |
Finland
|
Cross-country skiing | HES | |
| Mark Iuliano |
 Italy
|
Football (soccer) | Cocaine | |
| Dobri Ivanov |
 Bulgaria
|
Wrestling | Methandienone, Clenbuterol | |
| Anastasia Ivanenko |
Russia
|
Swimming | Furosemide | |
| Ivan Ivanov |
Bulgaria
|
Weightlifting | Furosemide | |
| Ksenia Ivlieva |
Russia
|
Swimming | Furosemide | |
| McKnee Ivorn |
 Barbados
|
Weightlifting | T/E 9,6 | |
| Ince Izzet |
 Turkey
|
Weightlifting | Methandienone |