This is a sub-list from List of doping cases in sport representing a full list of surnames starting with G.
| Name | Country | Event | Banned substance(s) | Reference(s) |
|---|---|---|---|---|
| Mohammed Gaber |
 Egypt
|
Weightlifting | ||
| Ivailo Gabrovski |
 Bulgaria
|
Cycling | EPO | |
| Al-Saadi Gaddafi |
 Libya
|
Football (soccer) | Nandrolone | |
| Éric Gagné |
 Canada
|
Baseball | Human growth hormone | |
| Alexander Gaidukov |
 Russia
|
Water polo | Carphedon | |
| Aaron Galindo |
 Mexico
|
Football (soccer) | Nandrolone | |
| Luiza Galiulina |
 Uzbekistan
|
Gymnastics | Furosemide | |
| Gao Yanzhi |
 China
|
Weightlifting | ||
| Ismael Garcia Bravo |
 Spain
|
Swimming | Ephedrine | |
| Sergio Garcia Ortiz |
Spain
|
Swimming | ||
| Juan Garriga |
Spain
|
Motorcycle racing | (never sanctioned; admitted to use after the end of his career) | |
| Lukasz Gasior |
 Poland
|
Swimming | Cannabis | |
| Richard Gasquet |
 France
|
Tennis | Cocaine (later forgiven by the excuse that he kissed a girl who used cocaine) | |
| Stefano Garzelli |
 Italy
|
Cycling | Probenecid | |
| Philippe Gaumont |
France
|
Cycling | Erythropoietin (EPO) (self-admitted) | |
| Michael Gausman |
 United States
|
Swimming | Cannabinoids | |
| Vikas Singh Gautam |
France
|
Volleyball | Steroids | |
| Anzhelika Gavrilova |
 Kazakhstan
|
Speed skating | Clenbuterol | |
| Pauline Gendrier |
France
|
Volleyball | Cocaine | |
| Ivan Gertlein |
Russia
|
Pole vaulting | DHEA | |
| Sylvain Georges |
France
|
Cycling | Heptaminol | |
| Tihomir Georgiev |
Bulgaria
|
Volleyball | Cannabinoids | |
| Amanda Gerhart |
Canada
|
Wrestling | Refusal to submit to doping test | |
| Dinko Geshev |
Poland
|
Swimming | Cannabis | |
| Ute Geweniger |
 East Germany
|
Swimming | Turinabol (self-admitted) | |
| Alireza Gharibi |
 Iran
|
Wrestling | D-methamphetamine | |
| Jason Giambi |
United States
|
Baseball | Human growth hormone, steroids (self-admitted) | |
| Jeremy Giambi |
United States
|
Baseball | Human growth hormone, steroids (self-admitted) | |
| Jay Gibbons |
United States
|
Baseball | Growth hormone | |
| Lewis Gibbons |
 United Kingdom
|
Football (soccer) | Benzoylecgonine, cannabis | |
| Jack Gibbs |
United Kingdom
|
Wheelchair basketball | ||
| Monica Gibellini |
Italy
|
Water polo | Cannabinoids | |
| Ed Giddins |
 England
|
Cricket | Cocaine | |
| Lukasz Giminski |
Poland
|
Swimming | ||
| Felice Gimondi |
Italy
|
Cycling | ||
| Everton Giovanella |
 Brazil
|
Football (soccer) | ||
| Christopher Girard |
Canada
|
Water polo | Cannabis | |
| Mads Glaesner |
 Denmark
|
Swimming | Levomethamphetamine | |
| Martin Gleeson |
United Kingdom
|
Rugby | Methylhexaneamine | |
| Ekaterina Gnidenko |
Russia
|
Cycling | Dehydrochlormethyltestosterone (Turinabol) | |
| Anthony Gobert |
 Australia
|
Motorcycle racing | Cannabis (Not sanctioned for first offence, but was released from contract by team) | |
| Luis Pereira Melo Godinho |
 Portugal
|
Volleyball | Cannabinoids | |
| Babak Goldasteh |
Iran
|
Wrestling | Anabolic steroids | |
| Andreas Goldberger |
 Austria
|
Ski jumping | Cocaine | |
| Daria Goltsova |
Russia
|
Weightlifting | Cocaine | |
| Joellison Viana de Silva Gomez |
Brazil
|
Weightlifting | Methylhexaneamine | |
| Kerem Gönlüm |
 Turkey
|
Basketball | Cathine | |
| Derlis Gómez |
 Paraguay
|
Football (soccer) | Coca | |
| Aitor González |
Spain
|
Cycling | Methyltestosterone metabolite | |
| Dee Gordon |
United States
|
Baseball | Exogenous Testosterone and Clostebol | |
| Dwight Gooden |
United States
|
Baseball | Cocaine | |
| Besarion Goshashvili |
 Georgia
|
Wrestling | Furosemide | |
| Anna Gostomelsky |
 Israel
|
Swimming | Prednisolone | |
| Ólafur Gottskálksson |
 Iceland
|
Football (soccer) | ||
| Lauren Goulart |
Brazil
|
Swimming | Methylhexaneamine | |
| Royce Gracie |
Brazil
|
Mixed martial arts | Nandrolone metabolite | |
| Sam Grammer |
United States
|
Highland Games | ||
| Johan Granath |
 Sweden
|
Speed skating | Unknown substance | |
| Guy Greavette |
Canada
|
Weightlifting | Anabolic steroids | |
| Robbie Green |
United Kingdom
|
Darts | Cannabis | |
| Elen Grigoryan |
 Armenia
|
Weightlifting | Methandienone | |
| Jason Grimsley |
United States
|
Baseball | Amphetamines, anabolic steroids, human growth hormone, (self-admitted) | |
| Kevin Grubb |
United States
|
Auto Racing | Refusal to submit to doping control | |
| Firas Guachai |
 Tunisia
|
Swimming | Testosterone | |
| Pep Guardiola |
Spain
|
Football (soccer) | Nandrolone | |
| Elzo Guerra Aranoz |
 Chile
|
Weightlifting | Methandienone | |
| Melvin Guillard |
United States
|
Mixed martial arts | Cocaine | |
| Zafar Guliyev |
Russia
|
Wrestling | Bromantan | |
| Fabrizio Guidi |
Italy
|
Cycling | Erythropoietin (EPO) | |
| Zahid Gulfam |
 Pakistan
|
Cycling | Nandrolone | |
| Ari Gunnarsson |
Iceland
|
Swimming | 19-Norandrosterone | |
| Mathias Gunthar |
Sweden
|
Wrestling | Furosemide | |
| Guo Tianxin |
China
|
Weightlifting | Clenbuterol | |
| Carlos Gurpegi |
Spain
|
Football (soccer) | 19-norandrosterone | |
| Keith Gurusinghe |
 Sri Lanka
|
Rugby union | Methylhexanamine | |
| Rebeca Gusmão |
Brazil
|
Swimming | Testosterone; Tampering | |
| Ferenc Gyurkovics |
 Hungary
|
Weightlifting | Oxandrolone |