Bloody Boys follows three families through three parallel stories.
| Actor | Role |
|---|---|
 Elin KlingaIda | Ida |
 Marika LagercrantzBirgitta | Birgitta |
 Jacob NordensonTomas | Tomas |
 Tom LjungmanKristoffer | Kristoffer |
 Stig EngströmGunnar | Gunnar |
 Nina GunkeLina | Lina |
 Rikard BjörkSimon | Simon |
| EEvert LindkvistLennart | Lennart |
 Felicia LöwerdahlElin | Elin |
| MMats SandahlBjörn | Björn |
| BBirgitta LekanderPsychiatrist | Psychiatrist |
| LLászló HágóRolf | Rolf |
| AAnna-Lena ErlandsonDrama teacher | Drama teacher |
| RRobert BolinPriest | Priest |
| MMåns EllmarkPolice officer 1 | Police officer 1 |
| FFredrik AnderssonPolice officer 2 | Police officer 2 |
 Christian FiedlerNot listed | Not listed |
| PPontus HallsbergNot listed | Not listed |
| RRolf SaxmarkNot listed | Not listed |
| EErik SöderbergNot listed | Not listed |
| AAlbin StööpNot listed | Not listed |
| PPer HoltstrandNot listed | Not listed |