Sniffer may refer to:
- Packet analyzer (aka network analyzer, protocol analyzer or sniffer), computer software or hardware that can intercept and log traffic passing over a digital network
- Allan Clarke (footballer born 1946), the Leeds Utd, Fulham and England striker known by that nickname
- A slang term for Intoxicative inhalants
- Sniffer (Anwar Ka Ajab Kissa), a 2013 Indian film directed by Buddhadev Dasgupta