CLOWN
| Acronym | Definition |
|---|---|
| CLOWN | Class Orientation With (Petri-) Nets |
| CLOWN | City Leicester Oxford Warwick Network (mathematics academic interchange network; UK) |
| CLOWN | Crazy Lunatics of the Wild North (gaming) |
| CLOWN | Clandestine Liberators of Oppressed Wimpy Nations (military slang/humor) |