A91
A91 or A 91 stands for:
- Dengue fever , ICD-10 code of the disease
Motorways:
- A91 road , a British trunk road
- A91 (Italy) , an Italian motorway
- Bundesautobahn 91 , a formerly planned German motorway
A-91 stands for:
- Autovía A-91 , a Spanish motorway
- KBP A-91 , a Russian automatic fire rifle
