| 28 cm kanon M/12 | |
| Origin: | Sweden |
| Type: | Naval artillery |
| Is Explosive: | yes |
| Is Artillery: | yes |
| Service: | 1916–1957 |
| Designer: | Bofors |
| Design Date: | 1912 |
| Manufacturer: | Bofors |
| Number: | 12 |
| Part Length: | (45 caliber) |
| Caliber: | 283mm |
| Rate: | 3-4 rpm |
| Max Range: | (25,000m post 1930's) |
| Elevation: | -10°/+20° (5°/s) |
| Traverse: | 150° from either side of centreline (4°/s) |
The Bofors 283 mm M/12 naval gun was a naval rifle of 283mm and 45 calibers used as the main battery of the Swedish s. It was designed and built by Bofors a few years before the First World War.