7 mm
# 7 mm

7 mm may refer to:

## Rail transport modelling

* 7 mm scale, 1:43.5 scale with rails 32 millimetres (1.3 in) apart, representing standard gauge
* HOn2 gauge, 1:87.1 scale with rails 7 millimetres (0.28 in) apart, representing narrow gauge

## Firearms

* 7 mm caliber, bullet cartridges used in guns
