Howard Cartman
| Gender | Male |
| Age | Unknown; likely 45-50 |
| Hair Color | Brown |
| Religion | Roman Catholic |
| Mother | Mabel Cartman |
| Father | Harold Cartman |
| Grandmother | Florence Cartman |
| Sister | Liane Cartman |
| Brother | Stinky Cartman |
| Nephew | Eric Cartman |
| Voiced by | Trey Parker |
| First Appearance | Merry Christmas Charlie Manson! |
Howard Cartman is Cartman's imprisoned uncle and Liane Cartman's brother who took the rest of his family hostage in "Merry Christmas Charlie Manson!" having broken out of jail.