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| HMMP | HyperMedia Management Protocol | |
| hub | | A USB device that has downstream ports to let further USB devices be plugged in |
| IDE | Integrated Development Environment | |
| IEEE 1394 | A high speed serial bus | Originally called FireWire |
| IFS | Installable File System | |
| IHV | Independent Hardware Vendor | |
| I/O | Input and/or Output | |
IN | | Specifies that a parameter is an input to a kernel routine |
| IN | USB Input packet | |
| INF | Installation information file | |
| interrupt | A USB data transfer type, for small regular data such as user input | |
| interface | | A set of USB endpoints |
| IOCTL | I/O Control Code | |
| IRB | IEEE 1394 | Request Blocks Requests to the IEEE 1394 bus driver |
| IRP | I/O Request Packet | |
| IRQL | Interrupt Request Level | |
| ISA | Industry Standard Architecture PC bus | |
| ISR | Interrupt Service Routine | Runs at DIRQL |
| isochronous | A USB data transfer type, for time-critical regular data | |
| LED | Light Emitting Diode |
