| Abkürzung | Bereich | Staat | Bedeutung |
| J | Staat | Japan | |
| Physik | Trägheitsmoment | ||
| jg. | Allgemein | D | jung |
| JPEG | Institut | USA | Joint Photographic Experts Group |
| JPG | Software | JPEG-Bild | |
| JVC | Firma | J | Japan Victory Company |
| kaufm. | Allgemein | D | kaufmännisch |
| KB | Einheit | Kilogramm | |
| Computer | Keyboard | ||
| KBD | Computer | Keyboard | |
| KBit | Einheit | Kilobit | |
| KBPS | Einheit | Kilobytes per Second | |
| Kenntn. | Allgemein | D | Kenntnisse |
| KG | Haus | D | Kellergeschoß |
| kg | Einheit | D | kilogramm |
| KI | Computer | D | Künstliche Intelligenz |
| KIPS | Einheit | Kilo Instructions Per Second | |
| KM | Haus | D | Kaltmiete |
| km | Einheit | Kilometer | |
| Kü. | Haus | D | Küche |
| L | Physik | Induktivität | |
| l | Physik | Länge | |
| LAN | Technik | Local Area Network | |
| LAP | Computer | Link Access Protocol | |
| LB | Computer | Left Button | |
| LBL | Computer | Label | |
| LBR | Computer | Library | |
| LBT | Computer | Local Bus Target | |
| LCP | Computer | Link Control Protocol | |
| LDA | Computer | Logical Device Address | |
| LED | Technik | Light Emitting Diode | |
| LF | Computer | Line Feed | |
| lg | Mathematik | dekadischer Logarithmus | |
| LHG | Gesetz | D | Landeshochschulgesetz |
| LIB | Software | Library | |
| LIPS | Computer | Logical Inferences per Second | |
| LISP | Computer | List Processing Programming (Programmiersprache) | |
| LN | Zeitung | D | Lübecker Nachrichten |
| ln | Mathematik | natürlicher Logarithmus | |
| LOG | Mathematik | Logarithmus | |
| log | |||
| LP | Allgemein | D | Langspielplatte |
| Technik | Lineprinter (Zeilendrucker) | ||
| Computer | Logical Partition | ||
| LPI | Computer | Lines per Inch | |
| LPM | Computer | Lines per Minute | |
| LPM | Computer | Lines per Second | |
| LQ | Computer | Letter Quality | |
| LRC | Computer | Local Register Cache | |
| lsg. | Allgemein | Lösung | |
| Lstk. | Allgemein | D | Lohnsteuerkarte |
| LU | Technik | Logical Unit |