| M.2 | 7 |
| M1 | 7 |
| MAC Address | 7 |
| Machine Language | 8 |
| Machine Learning | 6 |
| Macintosh | 2 |
| macOS | 3 |
| Macro | 5 |
| Macro Photography | 4 |
| Mail Server | 6 |
| Mainframe | 7 |
| Malware | 4 |
| MAMP | 8 |
| MAN | 8 |
| MANET | 10 |
| Margin | 4 |
| Markup Language | 5 |
| Martech | 8 |
| Mashup | 7 |
| Matrix | 5 |
| Mavericks | 6 |
| Maximize | 3 |
| Mbps | 4 |
| MBR | 10 |
| MCA | 9 |
| MDI | 8 |
| MDM | 7 |
| Mebibyte | 5 |
| Media | 4 |
| Media Compression | 7 |
| Media Queries | 7 |
| Medtech | 4 |
| Megabit | 3 |
| Megabyte | 2 |
| Megahertz | 3 |
| Megapixel | 3 |
| Meme | 6 |
| Memory | 2 |
| Memory Bank | 8 |
| Memory Leak | 8 |
| Memory Module | 7 |
| Memory Stick | 4 |
| Menu Bar | 3 |
| Mesh Wi-Fi | 6 |
| Meta Search Engine | 7 |
| Meta Tag | 7 |
| Metadata | 7 |
| Metafile | 7 |
| Metaheuristic | 8 |
| Metaverse | 5 |
| Method | 9 |
| MHL | 8 |
| Microblogging | 5 |
| Microcomputer | 7 |
| Microcontroller | 8 |
| Microkernel | 10 |
| MicroLED | 6 |
| Micron | 8 |
| Microphone | 2 |
| Microsoft | 2 |
| Middleware | 8 |
| MIDI | 4 |
| MIME Type | 8 |
| Mini DV | 5 |
| Minicomputer | 8 |
| Minification | 7 |
| Minimize | 3 |
| Minisite | 7 |
| MIPS | 8 |
| Mirror | 7 |
| Mirrored Volume | 7 |
| MIS | 8 |
| Mixed Reality | 6 |
| MMS | 5 |
| Mnemonic | 9 |
| Mobile | 4 |
| MoCA | 6 |
| Mod Function | 7 |
| Modem | 3 |
| Modifier Key | 6 |
| Modulation | 8 |
| Mojave | 6 |
| Molex Connector | 8 |
| Monitor | 2 |
| Monochrome | 5 |
| Monterey | 7 |
| Moodle | 6 |
| Motherboard | 5 |
| Motion Tween | 8 |
| Mount | 6 |
| Mountain Lion | 6 |
| Mouse | 1 |
| Mouse Pad | 1 |
| MP3 | 3 |
| MPEG | 4 |
| MTU | 6 |
| Multi-Core | 6 |
| Multi-Factor Authentication | 5 |
| Multicast | 8 |
| Multimedia | 1 |
| Multiplatform | 6 |
| Multiprocessing | 6 |
| Multitasking | 7 |
| Multithreading | 8 |
| Music Tracker | 8 |
| MVC | 9 |
| MySpace | 3 |
| MySQL | 7 |