Other
- Intruder (band), a Serbian electronica/pop band
- Intruder (metal band), a 1980s American thrash metal band
- Intruder (song), a 1980 song by the British singer Peter Gabriel
- Intruder (satellite), a spy satellite system by the US National Reconnaissance Office
- Intruder (air combat), an air combat mission in which fighter aircraft penetrate enemy airspace at night in order to interdict enemy air operations by ambushing enemy aircraft
- Operation Whitebait, a Royal Air Force Fighter Command countermeasure against German fighter aircraft during World War II, is a notable example of intruder operations
- A-6 Intruder, an American military aircraft
- Suzuki Intruder, a cruiser-type motorcycle
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