3.5 mm or 3.5mm may refer to:
- HO scale, in rail transport modelling, 1:87 scale, with rails 16.5 mm apart, representing standard gauge
- 3.5 mm jack, used on audio and mobile telephony equipment
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
If an internal link led you here, you may wish to change the link to point directly to the intended article.
If an internal link led you here, you may wish to change the link to point directly to the intended article.