| Efnisorð | Verk |
|---|---|
| Machine translating | 1 |
| Machinery | 2 |
| Machu Picchu (Perú) | 1 |
| MacNeice, Louis, 1907-1963 | 1 |
| Macroalgae | 1 |
| Macroeconomics | 2 |
| Mad studies | 1 |
| Madagaskar | 1 |
| Madrid | 1 |
| Maðjmabrot | 1 |
| Maður og umhverfi | 1 |
| Maðurinn (homo sapiens) | 18 |
| Maerl beds | 1 |
| Mafían | 2 |
| Magakrabbamein | 3 |
| Magasár | 1 |
| Magaspeglun | 2 |
| Magdalena Margrét Kjartansdóttir 1944 | 1 |
| Magi | 2 |
| Magnarar | 3 |