This is a sub-list from List of doping cases in sport representing a full list of surnames starting with C.
| Name | Country | Event | Banned substance(s) | Reference(s) |
|---|---|---|---|---|
| Javier Cabanas |
 Spain
|
Swimming | Epehedrine | |
| Enos Cabell |
 United States
|
Baseball | Cocaine | |
| Danny Cadamarteri |
 England
|
Football (soccer) | Ephedrine | |
| Cai Huijue |
 China
|
Swimming | Triamterene | |
| Valeriu Calancea |
 Romania
|
Weightlifting | Methandienone | |
| Michael Callens |
 Belgium
|
Swimming | Cannabis | |
| Filippo Calorosi |
 Italy
|
Tennis | ||
| Robinson Canó | Dominican Republic | Baseball | Furosemide | |
| Brad Cardinal |
 Canada
|
Wrestling | THC | |
| Jerome Cazenave |
 France
|
Water polo | Cannabis | |
| Oscar Camenzind |
 Switzerland
|
Cycling | Erythropoietin (EPO) | |
| Mike Cameron |
United States
|
Baseball | Stimulants | |
| Ken Caminiti |
United States
|
Baseball | Anabolic steroids (never sanctioned; admitted to use after the end of his career) | |
| Miguel Cammacho |
 Venezuela
|
Weightlifting | Metandienone | |
| Neil Campbell |
England
|
Cycling | HCG | |
| Guillermo Cañas |
 Argentina
|
Tennis | Hydrochlorothiazide | |
| José Canseco |
United States
|
Baseball | Anabolic steroids (never sanctioned; admitted to use after the end of his career) | |
| Ludovic Capelle |
Belgium
|
Cycling | Erythropoietin (EPO) | |
| Dean Capobianco |
 Australia
|
Athletics | Stanozolol | |
| Ivan Caprari |
Italy
|
Water polo | Cocaine | |
| Nuno Cardoso |
 Angola
|
Swimming | Nandrolone | |
| Salvador Carmona |
 Mexico
|
Football (soccer) | Steroids | |
| Alicia Carratero |
Spain
|
Diving | Cannabis | |
| Danilo Carrega |
 Brazil
|
Swimming | Stanozolol | |
| Anthony Carter |
 United Kingdom
|
Lawn tennis | Cannabis | |
| Stefano Casagranda |
Italy
|
Cycling | ||
| Francesco Casagrande |
Italy
|
Cycling | Testosterone | |
| Morales Castillo |
 Costa Rica
|
Cycling | GW501516 | |
| Enrico Catalano |
Italy
|
Swimming | THC metabolites | |
| Pietro Caucchioli |
Italy
|
Cycling | ||
| Rupeni Caucaunibuca |
 Fiji
|
Rugby union | Cannabis | |
| Greg Cavanagh |
Canada
|
Cycling | Testosterone | |
| Deniss Čerkovskis |
 Latvia
|
Modern pentathlon | Anabolic steroid | (in Latvian) |
| Sergo Chakhoyan |
Australia
|
Weightlifting | Stanozolol | |
| Rajib Chakraborty |
 India
|
Swimming | Attempted tampering of sample | |
| Paul Champalbert |
France
|
Swimming | Cannabis | |
| Sanamacha Chanu |
India
|
Weightlifting | Furosemide | |
| Maxime Chaply |
France
|
Swimming | Cannabis | |
| Justin Charles |
Australia
|
Australian rules football | Boldenone | |
| Mikalai Charniak |
 Belarus
|
Weightlifting | Mesterolone | |
| Julio Cesar Chavez Jr. |
Mexico
|
Boxing | Diuretics (2010) Cannabis (2012) | |
| Zuraini Che Rose |
 Malaysia
|
Weightlifting | Metandienone | |
| Cristiana Checchi |
Italy
|
Shot put | Doping | |
| Juan Ignacio Chela |
Argentina
|
Tennis | Metil-testosterone | |
| Chen Ganfen |
China
|
Swimming | ||
| Shiyun Chen |
China
|
Swimming | Prednisone | |
| Chen Sijia |
China
|
Swimming | Clenbuterol | |
| Alexei Cherepanov |
 Russia
|
Ice hockey | Nikethamide | |
| Chen Po-Pu |
 Chinese Taipei
|
Weightlifting | Methandienone | (in German) |
| Watsana Chianram |
 Thailand
|
Weightlifting | Methandienone | |
| Viktor Chislean |
 Moldova
|
Weightlifting | ||
| Velichko Cholakov |
 Bulgaria
|
Weightlifting | Steroids | |
| Elais Christoforou |
 Cyprus
|
Swimming | Ephedrine | |
| Traian Cihărean |
Romania
|
Weightlifting | ||
| César Cielo |
Brazil
|
Swimming | Furosemide | |
| Marin Čilić |
 Croatia
|
Tennis | Nikethamide | |
| Anatoli Ciricu |
Moldova
|
Weightlifting | ||
| Velichko Cholakov |
Bulgaria
|
Weightlifting | Metandienone | |
| Roger Clemens |
United States
|
Baseball | Anabolic steroids | |
| Clemence Clerc |
France
|
Water polo | Prednisone & Prednisolone | |
| Madga Cojom |
 Guatemala
|
Weightlifting | ||
| Julien Colchen |
France
|
Water polo | Terbutaline | |
| Kleon Coleman |
 Belize
|
Volleyball | Hydrochlorothiazide, Chloraminophenamide | |
| Carolina Colorado |
 Colombia
|
Swimming | Sibutramine | |
| James Comben |
England
|
Rugby union | Methylhexanamine | |
| Gloria Comerma |
Spain
|
Field hockey | ||
| Alberto Contador |
Spain
|
Cycling | Clenbuterol | |
| David Cookson |
United Kingdom
|
Rugby | Methylhexaneamine | |
| Chris Cooper |
United States
|
American football | THG | |
| Kit Cope |
United States
|
Mixed martial arts | Boldenone | |
| Guillermo Coria |
Argentina
|
Tennis | Nandrolone | |
| Chris Cornes |
England
|
Football (soccer) | Cocaine | |
| Alizé Cornet |
France
|
Tennis | Missed tests (later cleared due to misconduct by doping officer) | |
| Alejandro Cortes Gonzalez |
 Chile
|
Weightlifting | Dimethylpentylamine | |
| Leonardo Costa |
Brazil
|
Swimming | Stanozolol | |
| Ben Cousins |
Australia
|
Australian rules football | Methamphetamine (admitted to a U.S. rehab for treatment) | |
| Fernando Couto |
 Portugal
|
Football (soccer) | Nandrolone | |
| Alexander Crispim |
Brazil
|
Mixed martial arts | Desoxymethyltestosterone | |
| Cronulla-Sutherland Sharks (eleven players) |
Australia
|
rugby league | Various supplements | |
| Ryan Crowley |
Australia
|
Australian rules football | Methadone | |
| Kevin Cruz Soto |
Chile
|
Weightlifting | Dimethylpentylamine | |
| Brian Cushing |
United States
|
American football | hCG |