J band may refer to:
- J band (infrared), an atmospheric transmission window centred on 1.25 μm
- J band (JRC), radio frequency bands from 139.5 to 140.5 and 148 to 149 MHz
- J band (NATO), a radio frequency band from 10 to 20 GHz
This page was last edited on 3 March 2024, at 03:43