| Abkürzung | Bereich | Staat | Bedeutung |
| H | Physik | spezifischer Heizwert | |
| h | Physik | D | Höhe |
| HAL | Computer | Hardware Abstraction Layer | |
| HBA | Computer | Host Bus Adapter | |
| HD | Computer | Hard Disk | |
| High Density | |||
| HDC | Computer | Hard Disk Controller | |
| HDD | Computer | Hard Disk Drive | |
| HDTV | Technik | High-Definition-Television | |
| HDW | Technik | Hardware | |
| HDX | Technik | Half Dublex | |
| HEX | Mathematik | Hexadezimal | |
| HGA | Computer | Hercules Graphics Adapter | |
| HGC | Computer | Hercules Graphics Card | |
| HH | Stadt | D | Hansestadt Hamburg |
| Haus | D | Hinterhaus | |
| HL | Stadt | D | Hansestadt Lübeck |
| HLT | Computer | D | Halt |
| HMA | Computer | High Memory Area | |
| HP | Firma | USA | Hewlett Packard |
| HPSF | Computer | High Performance File System | |
| HPG | Software | Hewlett Packard Graphics | |
| HPPI | Computer | High Performance Parallel Interface | |
| HRG | Computer | High Resolution Graphics | |
| HS | Computer | High Speed | |
| HT | Computer | Horizontal Tab | |
| HTM | Software | Hypertext Markup Language | |
| HTML | Software | Hypertext Markup Language | |
| HTTP | Computer | HyperText Transfer Protocol | |
| Hzg. | Haus | D | Heizung |
| I | Physik | Lichtstärke | |
| Stromstärke | |||
| i.a. | Allgemein | D | im allgemeinem |
| I/O | Technik | Input / Output | |
| IBM | Firma | USA | International Business Machines |
| IC | Computer | Interrupt Controller | |
| ICBM | Institut | D | Institut für Chemie und Biologie des Meeres |
| ICO | Software | Icon | |
| ICP | Computer | Integrated Channel Processor | |
| IDA | Computer | Intelligent Disk Array | |
| IDT | Computer | Interrupt Descriptor Table | |
| IFA | Messe | D | Internationale Funkausstellung |
| IIV | Computer | D | Individuelle Informationsverarbeitung |
| IKL | Firma | D | Ingenieursbüro Lübeck |
| INS | Computer | Input String | |
| INTA | Computer | Interrupt Acknowledge | |
| INTR | Computer | Interrupt Request | |
| IP | Computer | Internet Protocol (TCP/IP) | |
| IOC | Computer | Input / Output Controller | |
| IOCS | Computer | Input / Output Control System | |
| IOTL | Computer | Input / Output Control | |
| IP | Computer | Internet Protocol | |
| IPC | Computer | Interprocess Communication | |
| IPS | Einheit | USA | Inch Per Second |
| IPX | Computer | Internetwork Packet Exchange | |
| IRC | Computer | Internet Relay Chat | |
| IRQ | Computer | Interrupt Request | |
| IS | Allgemein | Informationssystem | |
| Computer | Interrupt Status | ||
| ISA | Computer | Industry Standard Architecture | |
| ISAM | Computer | Index Sequential Access Method | |
| ISC | Technik | Instruction Set Computer | |
| ISO | Institut | International Standards Organization | |
| Normung | |||
| ISP | Computer | Internet Service Provider | |
| Interrupt Status Port | |||
| IT | Allgemein | USA | Information Technology |
| ITB | Allgemein | USA | Information Technology Branch |