- DIRN stands for Direction Interdépartementale des Routes Nord (French: Interdepartmental Directorate of Roads North)
- DIRN stands for Defined Interstate Rail Network (Australia)
- DirN stands for Directory Number (VoIP network)
- DIRN stands for Digital Interaction Research Network (Umeå University; Sweden)
- DIRN stands for Dispensational International Research Network (theology)
DIRN