Jamming may mean:
- Interfering with communications or surveillance:
- Radio jamming
- Radar jamming and deception
- Mobile phone jammer
- E-mail jamming
- Jamming (dance), cheered show-offs during social dancing
- Jamming (fanzine), a UK music fanzine of the 1970s–80s
- Jamming (physics), an apparent change of physical state
- Jamming (song), from Bob Marley's album Exodus
- Culture jamming, criticizing mass media through its own methods
- Jam session, a semi-improvised rock or jazz performance
- A rock climbing technique
- Jamming (knot), the tendency of knots to become difficult to untie
- The jamming of machine parts against each other, usually due to insufficient lubrication