C
| Name | Life | Profession | Cause of death | Reference |
|---|---|---|---|---|
| Andrés Caicedo | 1951–1977 | Writer | Secobarbital overdose. Suicide. | |
| Casey Calvert | 1981–2007 | Guitarist (Hawthorne Heights) | A rare lethal mixture of hydrocodone/APAP, citalopram, and clonazepam. Accidental. | |
| Ken Caminiti | 1963–2004 | Former Major League Baseball player. | Cocaine and opiate overdose. | |
| Max Cantor | 1959–1991 | Actor, journalist | Heroin overdose. | |
| Truman Capote | 1924–1984 | Writer | Liver disease complicated by phlebitis and multiple drug intoxication. | |
| Leslie Carter | 1986-2012 | Singer | While not attributing a cause of death, a police incident report stated Carter had suffered an overdose and was taking the prescription medications olanzapine, cyclobenzaprine and alprazolam. | |
| John Cassavetes | 1929–1989 | Writer, actor, director | Cirrhosis of liver due to alcoholism | |
| Vic Chesnutt | 1964–2009 | Musician | Overdose of prescription medication. Suicide. | |
| Maria Christina, aka Missy | 1967–2008 | Pornographic actress | Unspecified prescription drug overdose. Accidental. | |
| Diana Churchill | 1909–1963 | Naval officer | Barbiturate overdose. Suicide. | |
| Sally Clark | 1964–2007 | Solicitor | Alcohol poisoning. | |
| Sonny Clark | 1931–1963 | Pianist | Alcohol abuse; an attempt to conteract his heroin dependency. | |
| Steve Clark | 1960–1991 | Musician (Def Leppard) | Lethal overdose of codeine, along with valium and morphine and alcohol at more than 3 times the legal British limit. Accidental. | |
| Charmian Clift | 1923–1969 | Writer | Unspecified drug overdose. Suicide. | |
| Vander Clyde, aka Barbette | 1899–1973 | Trapeze artist | Unspecified drug overdose. Suicide. | |
| Bob Collins | 1946–2007 | Politician | Prescription drug and alcohol overdose. Suicide. | |
| Natasha Collins | 1973–2008 | Actress | Cocaine overdose. Accidental. | |
| Brian Cole | 1942–1972 | Musician (the Association) | Heroin overdose. | |
| Douglas Glenn Colvin, aka Dee Dee Ramone | 1951–2002 | Musician (the Ramones) | Heroin overdose. | |
| Michael Cooper | 1941–1973 | Photographer | Heroin overdose. | |
| Megan Connolly | 1974–2001 | Actress | Heroin overdose. | |
| Nancy Ann Coursey, aka Paige Summers | 1976–2003 | Pornographic actress | Codeine and oxycodone overdose. | |
| Pamela Courson | 1946–1974 | Retail. Wife of Jim Morrison | Heroin overdose. | |
| Nancy Crick | 1932–2002 | Euthanasia activist | Overdose of nembutal. Euthanasia. | |
| Robbin Crosby | 1959–2002 | Musician (Ratt) | Reported causes of his death include heroin overdose, and AIDS-related complications, which he admitted to contracting from shooting drugs. | |
| Bartley Crum | 1900–1959 | Lawyer | Washed down an entire bottle of Seconal with whisky. Suicide. | |
| William Cuppy | 1884–1949 | Literary critic | Sleeping pill overdose. Suicide. | |
| Patricia Cutts | 1926–1974 | Actress | Barbiturate overdose. Suicide. |
Read more about this topic: List Of Drug-related Deaths