Interlock can refer to the following:
- Ignition interlock device
- Interlock (band) an industrial/alternative metal band
- Interlock (engineering)
- Interlocking (railway signaling)
- Interlock (cinema projection)
- Interlocking tower
- an interlocked hutch in a synchrotron radiation beamline protects user from being accidentally exposed to radiation when a beamline is active
- Interlock Protocol, a cryptographic protocol designed to thwart eavesdropping when using an anonymous key exchange protocol, such as Diffie-Hellman
- Interlock role-playing system
- Interlocking spur: landsliding occurring in a river's upper course which modifies the river bed pattern
- Mechanically-interlocked molecular architectures in Supramolecular chemistry comprises a.o., Catenane and Rotaxane molecules, and Molecular knot
- Interlock fabric, a double-knitted jersey fabric.
- Interlocking directorate (business)
- Hocket and kotekan (musical techniques)