9 mm or 9×19mm Parabellum is a firearms cartridge.
9 mm or 9mm may also refer to:
- "9mm" (song), David Banner song
- 9 mm caliber, cartridges other than 9×19mm with 9 mm bullets
- 9mm Parabellum Bullet, a Japanese rock band
Rail transport modelling
- N gauge, 1:160 scale, with rails 9 mm apart, representing standard gauge
- British N gauge, 1:148 scale, with rails 9 mm apart, representing standard gauge
- H0e/HOn30 gauge, 1:87.1 scale, with rails 9 mm apart, representing narrow gauge
- OO9, 1:76 scale, with rails 9 mm apart, representing narrow gauge in Britain
- Gnine/IIp gauge, 1:22.5 scale, with rails 9 mm apart, representing minimum/miniature gauge
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